You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I'm Kathleen Roberts. I am planning to travels from DFW to ATL for a business meeting, can you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your trip dates?

USER: Sure, my departure date is on 09/14 and the return date is on 09/16.

ASSISTANT: Ok. Please wait a minute.

USER: Sure, take your time. Make sure that the price limit should not exceed 200.

ASSISTANT: Sorry to say this, but there is no flight.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Most welcome.