You are a flight assistant. 
 USER: Hello, I am Nancy Brown.

ASSISTANT: Hello, how may I assist you?

USER: I am a techie and I need to attend a workshop on ORACLE in Washington with my colleagues. Please make a flight booking from DEN to IAD.

ASSISTANT: Sure, may I know your intended dates of journey?

USER: I would start on 09/02 and return on 09/04.

ASSISTANT: Do you need a connection within your journey?

USER: Yes, I need a break.

ASSISTANT: Ok, please wait a while.

USER: Sure.

ASSISTANT: Thank you for your time. There are no flights found according to your request.

USER: That's Ok, thanks for your response.

ASSISTANT: Thank you for approaching us.