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: Hi. 
 agent: Hello. 
 customer: I am Jennifer Mitchell. 
 agent:  Jennifer Mitchell. How can I help you? 
 customer: I have client meeting in my office. So, can you please help me in cancelling my recent reservation? 
 agent: Sure Jennifer Mitchell. 
 customer: Ok. 
 agent: Sorry to inform that there is no reservation by the name  Jennifer Mitchell. 
 customer: Ok, thank you for your information. 
 agent: Thank you for contacting us.
no_reservation