You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Myself Betty White, I am planning my holiday trip to visit Minneapolis. Can you please help me in booking the ticket from DFW to MSP?

ASSISTANT: Sure, can you please provide me your travel dates? Ok, please be on hold for a while.

USER: I will take-off 01/25 an again I will be return back on 01/27.

ASSISTANT: Sorry to say you that there is no flight available on your preferred travel dates.

USER: Not a big problem, anyhow thank you very much for your service.

ASSISTANT: You are welcome and thank you for choosing us.