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 Betty Allen. 
 agent: Hello, how may I assist you? 
 customer: Could you help me in ticket booking from SEA to DEN, under the price limit of 1000? I want the connection limit to be 1. 
 agent: Ok, please mention your travelling dates? 
 customer: And my journey dates are from 07/01 to 07/03. 
 agent: Please wait for a moment. 
 customer: Sure. 
 agent: Sorry for the inconvenience, there were no flights found with your specified dates. 
 customer: Ok, no problem. Thank you for your service. 
 agent: Thanks for connecting us, hope to serve you again.
A: 
no_flight