Detailed 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
Q: customer: Hello. My name is Anna Robinson. 
 agent: Hello Anna, how can I help you today? 
 customer: I would like to travel from PHL to PHX to meet my friend. Can you help me for booking a flight ticket? 
 agent: Sure, I will help you in booking. please share your travel dates too. 
 customer: My travelling dates are 01/16 and 01/18. 
 agent: Please wait a moment. 
 customer: Ok, take your time. 
 agent: Sorry, no flights are available on your route. 
 customer: That's ok, thank you for your information. 
 agent: Welcome, have a nice day. Thank you for availing us.
A:
no_flight