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: Hi. 
 agent: Hello, how can I aid you today? 
 customer: Can you help me to book a flight from AUS to PHX? 
 agent: Sure, we are here to help you. Can you share me your travelling dates? 
 customer: My travelling dates are Mar 31 and Apr 02. 
 agent: May I know your name? 
 customer: Sure, I am Carol Scott. 
 agent: Do you have any other specifications? 
 customer: I prefer connecting flight. 
 agent: Ok, wait for some time. 
 customer: Sure. 
 agent: Thanks for waiting there are no flights found on your details. 
 customer: No issues, thank you for your time. 
 agent: Thanks for approaching us.
A:
no_flight