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. I am Gregory Smith. 
 agent: Hello, how can I help you today? 
 customer: Will you please assist me in booking a flight ticket from IAH to LGA as I am planning to visit Central Park at New York? 
 agent: Sure, when are you planning to travel? 
 customer: I would like to depart on June 06 and return on June 08. 
 agent: Do you need a connecting flight? 
 customer: Yes, I need a flight with single connection. 
 agent: Do you need a business class or a economy class? 
 customer: I am comfortable with any class. 
 agent: Do you have any preferences with the timing? 
 customer: My depart time should be morning. 
 agent: Thank you for your details, there are no flights found with the given details. 
 customer: Ok, no problem. Thank you for your response. 
 agent: Thank you for opting us.
A:
no_flight