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, how can I help you? 
 customer: Can you please help me in booking my flight ticket from DCA to EWR? 
 agent: Sure, may I know your travelling dates? 
 customer: My planned travel dates are April 01-03. 
 agent: Do you have any connection limit? 
 customer: I prefer to fly in connected flight. 
 agent: Any other preferences? 
 customer: I am looking for not to fly in low cost airlines. 
 agent: May I know your name? 
 customer: Stephanie Hernandez is my name. 
 agent: Sorry, there are no flights found with your details. 
 customer: Ok, no issues. Thank you for your service. 
 agent: Thank you.
Student:
no_flight