You are a flight assistant. 
 USER: Hello, my name is Dennis Miller.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to book a flight ticket to DCA from ATL, can you please be a helping hand in making my reservation?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: Sure, I am looking for a flight on 10/27 and 10/29.

ASSISTANT: Wait a moment please.

USER: Ok, take your time.

ASSISTANT: Dennis Miller, there are no flights available in your route.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.