In this task, you are given a conversation between a flight agent and the customer. You are given 4 options and you need to select the goal of the conversation. It is provided as part of customer's context, which has to be one of the following: `book`: Make a new reservation, `cancel`: Cancel an existing reservation, `no_flight`: No flight found for the customer's preference, `no_reservation`: No reservation / No change / No cancellation was made in the conversation, mostly enquiring details

Input: Consider Input: customer: Hello. 
 agent: Hello, how may I aid you? 
 customer: I am Kenneth Perez. I would like to book a ticket from DCA to SEA, can you please help me out? 
 agent: I am glad to help you about that. Can you please provide your planned dates of journey? 
 customer: I am travelling on these dates 12/08 and 12/10. 
 agent: Hold on for sometime. 
 customer: Make sure my connection limit is 0. 
 agent: Sorry Perez, there is no flights on your planned dates of journey. 
 customer: Ok no problem, thank you for your services. 
 agent: Most welcome, thank you for reaching out here.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello. 
 customer: Emily Clark here. 
 agent: How may I lend a hand to? 
 customer: I need to have a flight ticket from OAK to AUS for an important business meeting, can you please help me out with booking of a flight ticket on those locations? 
 agent: Sure Clark, When you are willing to travel? 
 customer: I would like to start my journey on 12/29. 
 agent: Just a moment. 
 customer: Sure. 
 agent: Can you please share me your return dates? 
 customer: I would like to return on 12/31. 
 agent: Clark sorry to intimate, no flights are available with your requirements. 
 customer: Oh! Sad to hear that. Anyway, I will contact another agency to go there. Thank you for the information. 
 agent: You are welcome, thank you very much for contacting us.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello. 
 customer: Myself Eric Anderson. 
 agent: In which way I can assist you today? 
 customer: Can you please book a flight ticket from ORD to SFO? 
 agent: Sure, I can help you in booking flight ticket. 
 customer: Thank you. 
 agent: May I know your preferable travel dates for booking flight ticket? 
 customer: Sure, I need to travel on dates of 06/03 and 06/05. 
 agent: Ok, please wait a moment, I will check flight availability. 
 customer: Sure, take your time. 
 agent: There is a flight available in this route, airline is Spirit and flight number is 1001. Are you ok with this flight? 
 customer: That's fine, please proceed with booking. 
 agent: Your flight ticket is booked successfully. 
 customer: Thank you for your help. 
 agent: Thank you for contacting us, have a nice day. 
 customer: Most welcome.
Output: book