Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hello. 
 agent: Hello, how can I help you? 
 customer: I want to travel from EWR to AUS. My travelling dates are from 07/14 to 07/16. 
 agent: Ok, please wait for a moment. 
 customer: Make sure that there is 1 connection. 
 agent: Sorry, there are no flights available regarding your journey. 
 customer: That's ok. 
 agent: Do you want any other information please? Ok. Thank you and have a nice day. May I know your name please? 
 customer: Gary Allen here. Thank you for your support.
Student:
no_flight