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

Q: customer: Hello. I am Elizabeth Lee. 
 agent: Hello, how may I aid you? 
 customer: I would like to cancel my recent reservation as my workshop got cancelled. 
 agent: Sure, please wait a moment I will check and get back to you. 
 customer: OK. 
 agent: Thanks for waiting, unfortunately there is no reservation found with your name. 
 customer: Ok, thank you for your response. 
 agent: Thanks you.

A: no_reservation
****
Q: customer: Hello, my name is Katherine Miller. 
 agent: Hello, Katherine Miller. How can I assist you? 
 customer: I am planning to spend my vacation holidays with my brother, so I need to make a flight reservation. 
 agent: OK, what is your exact destination and when do you want to go? 
 customer: My destination airport is PA-PHL, and my travelling dates are departure on 03/20 and arrival on 03/22. 
 agent: Let me know your source point. 
 customer: My source airport is San Francisco, CA-SFO. 
 agent: Sorry to inform, no flights are found regarding to your specifications. 
 customer: That's not a problem, thanks for your information. 
 agent: Thanks for choosing us. Have a great day.

A: no_flight
****
Q: customer: Hi. 
 agent: Hello. How may I guide you today? 
 customer: Can you find a flight for me from OAK to DFW? 
 agent: Sure, I am here to help you with that. Can you please share your planned travel dates? 
 customer: Ok, my journey dates are from June 05 to 07. 
 agent: May I know your name please? 
 customer: Sure, I am Stephen White. 
 agent: Do you have any class preference? 
 customer: No, I need a connecting flight. 
 agent: Would you like to travel in a connecting flight or in direct flight? 
 customer: I need a connecting flight as I said before. 
 agent: Do you have any other specifications? 
 customer: No. 
 agent: Flight-1017 is available in Delta Airlines with single connection limit and the ticket price is 100. Shall I proceed with booking? 
 customer: Yes, please. 
 agent: Stephen White, your booking is done in economy class, the depart time and return time is  afternoon. 
 customer: Thank you. 
 agent: Most welcome, thank you for reaching us. Have a safe journey.

A:
book
****