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. 
 customer: I am Elizabeth Walker. 
 agent: How may I assist you today? 
 customer: Will you please assist me in booking a flight ticket from ATL to CLT? 
 agent: Sure, may I know your travelling dates, please? 
 customer: I am planning to depart on June 07 and return on June 09. 
 agent: Do you need any specification? 
 customer: I need a halt in between my journey. 
 agent: Sorry, there are no flight tickets available on your journey dates. 
 customer: Ok, no problem. 
 agent: Thank you for reaching our service. 
 customer: Thank you for the information.
A:
no_flight