Instructions: 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: customer: Hello. 
 agent: Hello. How can I assist you? 
 customer: I am Jennifer Clark. I am planning to visit my cousin's home at Philadelphia. Can you please book a ticket from SFO to PHL? 
 agent: Sure, please provide your travel dates. 
 customer: I would like to travel on 06/30 and return back on 07/02. 
 agent: The flight 1025 of Spirit airlines is available on your requested dates with a price of 100. Shall I proceed? 
 customer: Yes, you can proceed the booking. 
 agent: Clark, your reservation has done successfully. 
 customer: Thank you for your service. 
 agent: You are welcome.
Output:
book