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: Eric Martin here. Could you book my ticket in a connecting flight? 
 agent: I am happy to help you, please provide your journey dates. 
 customer: I want to leave on Dec 31 and return on Jan 2. 
 agent: Ok, may I know your airport codes to get a flight for you? 
 customer: I want to travel from ORD to PHX. 
 agent: Do you have any class preferences? 
 customer: No, I want to return in the evening. 
 agent: Sorry, there is no flight for you on your planned dates. 
 customer: No problem, thank you. 
 agent: Thanks for reaching us.
A:
no_flight