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 at this moment? 
 customer: I am Patricia Rodriguez. Can you help me to book a flight ticket from DEN to LGA? 
 agent: Sure, may I know your planned travelling dates? 
 customer: My travelling dates are 05 and 17 of July. 
 agent: Do you need a connection in between your journey? 
 customer: I need a connecting flight. 
 agent: Unfortunately, there are no flights found according to your requirement. 
 customer: It's ok, thank you for giving information. 
 agent: Thank you, for reaching us.
no_flight