You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Raymond Green.

ASSISTANT: How can I assist you?

USER: I am planning to attend music concert at SEA, can you please help me with booking a flight ticket from DCA?

ASSISTANT: Sure, can I know the travel dates please?

USER: Sure, I would like to take off 06/11 and return on 06/13.

ASSISTANT: Ok, wait a moment please.

USER: Ok, but please make sure that the connection limit is 0.

ASSISTANT: Sorry to say that, there are no flights found on your dates.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for approaching us.

USER: You are welcome.