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: Hi,. I am Catherine Collins. 
 agent: Hello, how can I provide assistance to you? 
 customer: I am planning to visit Arlington national cemetery hop-on hop-off tour in Washington DC - DCA. Can you avail me to book a flight with one halt? 
 agent: Sure, May I know from where you wish to board? 
 customer: I want to board from Oakland, CA - OAK. 
 agent: On which dates would you like me to book a flight ticket for you? 
 customer: I want to fly on 08/05 and recur on 08/07. 
 agent: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions. 
 customer: Ok, thanks for the information. 
 agent: Thank you for choosing us.
A:
no_flight