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
Q: customer: Hello. 
 agent: Hello. How may I assist you? 
 customer: I am looking for a direct flight for my journey, can you please check out is there any flight available for me? 
 agent: Sure, I will help you. Can I have your planned travel dates please? 
 customer: Thank you for accepting my request, my boarding is on May 30 and please book my return ticket on June 01. 
 agent: May I know your origin and destination airport codes please? 
 customer: Sure, I want to travel from EWR to DTW. 
 agent: Can I have your name please? 
 customer: Sure, my name is Catherine Lewis. 
 agent: May I know your depart and return timings? 
 customer: I can manage with any timings. 
 agent: Do you have any other specifications? 
 customer: No. 
 agent: Catherine Lewis, no flights has been found on your planned travel dates. 
 customer: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information. 
 agent: Thank you for approaching us. 
 customer: Welcome.
A:
no_flight