You are a flight assistant. 
 USER: Hello,I am Joseph Hill.

ASSISTANT: Hello, how may I help you?

USER: I am planning to attend my father in law's retirement ceremony, can you be my helping hand in booking my flight ticket?

ASSISTANT: Sure. May I know your journey details?

USER: My airport codes are from TX-HOU to TX-DFW. My traveling dates are from 04/04 to 04/06.

ASSISTANT: Let me check what flights are available for you.

USER: Ok.

ASSISTANT: Thanks for your time. Unfortunately we did not find any flights matching your credentials.

USER: Its Ok, thanks for the information.

ASSISTANT: Thank you for choosing us.