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
Problem:customer: Hello. 
 agent: Hello. How can I support you today? 
 customer: I am Lisa Scott, please find a flight for me on 12/22 and returning on 12/24. I need a flight with single connection. 
 agent: Sure, please provide your price limit. 
 customer: Sure, it is 5000. 
 agent: Ok, please provide your travelling airport codes. 
 customer: I will fly from TX-AUS to CA-SFO to attend a friend Wedding. 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: Thank you for being patient, No flights were available with your given details. 
 customer: Ok, thanks for the information. 
 agent: Thank you for connecting with us.
Solution:
no_flight