You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Lisa Jackson.

ASSISTANT: What service you are expecting from our flight booking agency?

USER: I am planning to book  a ticket from IAD to BOS. Can you please help me out?

ASSISTANT: Sure, I am here to serve you with that. Could you please provide me your planned travel dates?

USER: I would like to travel on 11/07 and return back on 11/09.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: I am sorry for the trouble which is caused to you, there are no flights found on the dates you have provided to me.

USER: That's fine. Thank you for your service.

ASSISTANT: My pleasure. Thank you for contacting us.