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 assist you today? 
 customer: I planned to meet my friend in IAH, can you please help me to book a flight ticket from LGA? 
 agent: Sure, may I know your  planned trip dates? 
 customer: I prefer to travel on Jun 18 and Jun 20. 
 agent: Do you have any connection limit? 
 customer: I prefer to travel in a connecting flight. 
 agent: Any other requirements to be met? 
 customer: No. 
 agent: May I know your good name? 
 customer: I am Kenneth Rodriguez. 
 agent: Sorry, there are no flights found with your given details. 
 customer: Ok, no problem. Thank you for your information. 
 agent: Thank you for reaching us.
no_flight