Given the task definition and input, reply with output. 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 Jennifer Clark. I need to reach San Francisco to attend a party meeting. Can you book me a ticket from JFK to SFO?
agent: Sure, we are willing to help you. May I know your connection preference?
customer: I need a single lay by.
agent: Ok, what are your planned dates to travel?
customer: I would start on 06/30 and return on 07/02.
agent: Ok, let me check the availability of flights on your route.
customer: Ok.
agent: Jennifer Clark, we found a connecting flight in UA airline at a price of 100 in economy class and flight number is 1018.
customer: Fine, please proceed.
agent: Shall I proceed?
customer: Yes.
agent: Your booking was done.
customer: Thanks for your support.
agent: Thank you for choosing us.
book