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. 
 customer: I am Steven Robinson. 
 agent: How may I assist you today? 
 customer: I need a flight to travel on 04/08 to the location SEA on the opening of my new company, can you find a flight for me to travel? 
 agent: Sure, I will help you to find a flight. Before that, may I know your boarding airport code and return journey date? 
 customer: My boarding airport code is OAK and my return journey date will be on 04/10. 
 agent: Sorry Steven, I cannot find any flight with your travel dates. 
 customer: Oh! It's ok, no problem. I will travel on some other day. 
 agent: Thanks for contacting us, have a great day. 
 customer: Thank you.
Student:
no_flight