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: Hi. 
 agent: Hello, how can I help you? 
 customer: I am Stephanie Clark, can you help me to book a flight with 1 connection? 
 agent: Sure, can you share me your travelling dates? 
 customer: My travelling dates are 12/07 and 12/09. 
 agent: May I know your journey locations? 
 customer: My preferred airport codes are PHX and IAD. 
 agent: Ok, wait for some time. 
 customer: Ok. 
 agent: Thanks for waiting there is no flights found on your details. 
 customer: Ok, no issues. Thank you for your information. 
 agent: Thanks for choosing us.
Student:
no_flight