You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Ronald Jones, I want to book a ticket from IAD to BOS for meeting my friend.

ASSISTANT: Ok, can you please provide your traveling dates?

USER: My travel dates are 12/14 to 12/16.

ASSISTANT: Please wait a moment, I will let you know.

USER: Take your time.

ASSISTANT: Sorry to inform you Ronald Jones, there is no flights available as per your requested dates.

USER: It's fine, thanks for helping me out.

ASSISTANT: You are welcome Ronald Jones.