You will be given a definition of a task first, then some input of the task.
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

customer: Hello. 
 agent: Hello, How can I aid you? 
 customer: I am Amy Mitchell want to travel to MA- BOS to enjoy beach holidays with my cousins. 
 agent: Ok. 
 customer:  Can you book a ticket from TX-IAH? 
 agent: Sure, I am here to help you. May I know your travelling dates? 
 customer: My travelling dates are 01/24 and 01/26. 
 agent: Please wait. 
 customer: Ok. 
 agent: Thanks for waiting. You have a single connecting flight in JetBlue airline and flight number 1017 having price 100. Shall I proceed? 
 customer: Ok, you can proceed. 
 agent: Your ticket has been booked. 
 customer:  Thank you for booking. 
 agent: Thank you.
Output:
book