Given the task definition and input, reply with output. 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

customer: Hello. 
 agent: Hello. 
 customer: I am Ashley Brown. 
 agent: How may I best help you today? 
 customer: I would like to attend a event in Seattle with my family. Could you please help me to book a ticket from IAH to SEA? 
 agent: Sure, I will help you. To check the flight availability we need your scheduled dates, can you please share me your preferable dates? 
 customer: My travelling dates will be on 10/17 to 10/19. 
 agent: Do you prefer connecting flight or direct flight? 
 customer: I need a connecting flight. 
 agent: We found a direct flight but there is no connecting flight. 
 customer: Ok, not an issue. Thank you. 
 agent: Thank you for communicating us.
no_flight