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. 
 agent: Hello, how may I assist you? 
 customer: I am Margaret Turner, I would like to travel from AUS to LGA. 
 agent: Ok, can I know your journey dates please? 
 customer: My travelling dates are 03/30 and 04/01. 
 agent: Sorry to say this Turner, there are no flights on your requested dates. Sorry for the inconvenience provided. 
 customer: It's ok. Thank you for checking. 
 agent: Thank you for choosing us.
A:
no_flight