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

Example Input: customer: Hello. 
 agent: Hello. How may I assist you today? 
 customer: Ashley Thomas here. I want to cancel my recent reservation. Can you help me for this one? 
 agent: Sure, we are here to help you. Sorry to inform you that there is no active reservation found on your given name. 
 customer: No issues, thank you for your information. 
 agent: Thanks for reaching us, have a nice day.
Example Output: no_reservation

Example Input: customer: Hi. 
 agent:  Hello, How exactly I can serve you the best today? 
 customer: I need to change my trip dates in my recent reservation, can you serve me in changing this? 
 agent: Sure, I will help you with that. 
 customer: Thanks. 
 agent: May I know your name to check your details in our database? 
 customer: Lisa Evans is my name, you can check with this. 
 agent: Please wait a while. 
 customer: OK. 
 agent: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name. 
 customer: OK. Not a problem, Thanks for your time with us. 
 agent: Thank you for choosing us.
Example Output: no_reservation

Example Input: customer: Hello, I am George Roberts. 
 agent: Hello, how may I serve you today? 
 customer: I want to travel from AUS to DFW for a meeting, Can you please book a ticket for me? 
 agent: Sure, may I know your travelling days? 
 customer: My depart is on 05/27 and return is on 05/29. 
 agent: Please wait for a moment, I will check the availability of flights and inform you. 
 customer: Sure. 
 agent: Thank you for waiting. Sorry to inform you that unfortunately there are no flights available on the specified days. 
 customer: Thank You. 
 agent: Thank you for contacting us.
Example Output:
no_flight