You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jessica Evans.

ASSISTANT: How can I  help you?

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

ASSISTANT: Your travelling dates please?

USER: Sure, I would like to take off on Aug 26 and return on Aug 28.

ASSISTANT: I am sorry no flights found on your route.

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

ASSISTANT: Thank you for choosing us.

USER: You are welcome.