You will be given a definition of a task first, then some input of the task.
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 guide you? 
 customer: Myself Frank Anderson. I will be travelling from Oakland to visit my grandmother, can you help me? 
 agent: Sure, can I know your preferable dates? 
 customer: My travel dates will be from 10/25 to 10/27. 
 agent: Can I know your airport codes? 
 customer: My travelling airport codes will be from OAK to MSP. 
 agent: I found a flight 1017 which matches with your preferences, can I proceed? 
 customer: May I know the price? 
 agent: The price of ticket is 200. 
 customer: Ok, please book this flight for my journey. 
 agent: Your ticket is booked with Hawaiian airlines. 
 customer: Thank you for assisting me with booking my reservation. 
 agent: Thank you, have a good day. 
 customer: Most welcome.
Output:
book