Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hello. 
 agent: Hello. 
 customer: I am Karen Johnson. 
 agent: How may I aid you today? 
 customer: I want to attend transportation festival at Phoenix, PHX. Can you help me in booking with a connecting flight? 
 agent: Sure, I will help you. Can I have your trip dates? 
 customer: My travelling dates are from 08/21 to 08/23. 
 agent: Help me with the source code? 
 customer: My source code is Houston, HOU. 
 agent: Thank you for your details, we found a direct flight to your destination. Shall I proceed to book? 
 customer: Do not proceed. Thanks for the information. 
 agent: Thank you for reaching us.
Student:
no_reservation