You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am George Hernandez. I want to book a flight ticket from DFW to IAH. Could you help me in booking?

ASSISTANT: George Hernandez. Could you please provide me with your trip details.

USER: My travelling dates are from Sep 18 to Sep 20.

ASSISTANT: Please give me moment.

USER: Ok.

ASSISTANT: Sorry, no flights found for this search.

USER: That's ok, no problem Thank you.

ASSISTANT: Thank you approaching us.