You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is James Davis.

ASSISTANT: I would like to know how can I assist you at this pleasant evening?

USER: My boss has assigned me a work to complete at Boston. Can you find any flights available from Washington?

ASSISTANT: Sure, may I know your business trip dates?

USER: I am planning to travel on 01/13 and return on 01/15.

ASSISTANT: Ok. Can you tell me if you know about Boston and Washington airport codes?

USER: My source and destination airport codes are IAD and BOS.

ASSISTANT: Ok. Wait a minute.

USER: Sure.

ASSISTANT: Sorry to say this, there is no flight in this route. Thank you to visit us.

USER: Ok, that's fine. I will check other means of transport. Thank you for the information.