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: Hi. 
 agent: Hello. 
 customer: I am James Wilson. 
 agent: How may I help you? 
 customer: Ia m planning to travel from SFO to PHL, can you help me in booking? 
 agent: May I know your travel dates? 
 customer: my travelling dates are 06/20 to 06/22. 
 agent: Sorry, there is no flight found basis on your details. 
 customer: Ok, fine thank  you for checking. 
 agent: Thank you for reaching us.
no_flight