You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I need a flight ticket reservation from Oakland, CA - OAK to Seattle, WA - SEA.Can you book a ticket  for me?

ASSISTANT: Sure, I will book a ticket, we need your traveling dates and your name, could you please provide me?

USER: My preferable dates are departure 01/06 and return on 01/08 with price limit 200 and connection limit must be one. David Brown is my name.

ASSISTANT: Thanks for providing your details, please wait a moment, I will check and get back to you.

USER: OK.

ASSISTANT: Thanks for waiting, I am sorry to say that there is no flight on your route .

USER: OK, no problem.

ASSISTANT: Thank you choosing us.

USER: Thanks for your information.

ASSISTANT: Have a nice day.