You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I need to book a flight ticket from DFW to IAH, Can you please help me for booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: I would like to travel on 11/24 to return on 11/26.

ASSISTANT: Do you have any requirements?

USER: Yes, I need a connecting flight with economy class.

ASSISTANT: Can I know your name?

USER: Christopher Williams here.

ASSISTANT: Let me know your requirements?

USER: No.

ASSISTANT: Sorry to say, no flight is available for you as per you requirements.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.