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. How may I aid you today? 
 customer: My name is Roberts Collins, I want to book a connecting flight to meet friend at Houston. Can you book a flight from NY-JFK to TX-HOU? 
 agent: Sure, when are you planning to start and return on? 
 customer: I will fly on 07/09 and return on 07/11. 
 agent: Thank you for your details, there are no flights found with the given details. 
 customer: Thank you for the information. 
 agent: Thank you for contacting us.
no_flight