You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Debra Davis.

ASSISTANT: How may I help you today?

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

ASSISTANT: Sure, I will help you with that. Can you please share your journey dates?

USER: Sure, I would like to take off on 04/30 and return date 05/02.

ASSISTANT: Wait for a while. I am sorry to say that there is no flight found.

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

ASSISTANT: Thank you for contacting us.

USER: You are welcome.