You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Larry Miller.

ASSISTANT: How can I assist you today?

USER: I want to book a ticket from DFW to HOU to attend seminar, can you help me in booking?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: I am departing on 03/22 and return on 03/24.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us, have a great day.