Q: 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, I am Jessica Jones. 
 agent: Hello, how may I address you? 
 customer: I want to attend Earth and Nature festivals at SFO from BOS. Can you please help me to book a flight? 
 agent: Sure, when are you planning to make your trip? 
 customer: I want to fly on July 2 and need to return on July 4. 
 agent: Will you please let me know your airline preference? 
 customer: I am comfortable with any airline. 
 agent: Do you have any specific depart and arrival time for this trip? 
 customer: Yes, I want to depart in morning time. 
 agent: How many connections are you looking for? 
 customer:  I'm looking for flights with maximum connection of 1. 
 agent: Lastly, do you prefer an economy class or business class ticket? 
 customer: No, I am ok with any class. 
 agent: Ok, please allow me a moment. 
 customer: Sure, take your time. 
 agent: We regret to inform that there are no flights available matching your credentials. 
 customer: Ok, no problem. Thank you for checking. 
 agent: Thank you for consulting us.
A:
no_flight