You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Linda Lewis. I would like to book a flight ticket from IAH to DFW.

ASSISTANT: Sure, can you please tell your travelling dates?

USER: I am planning to start on 02/20 and return back on 02/22.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you and have a nice day.