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 ORD, Can you please help me for booking?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: I would like to travel on 02/07 to return on 02/09.

ASSISTANT: Do you have any requirements?

USER: No.

ASSISTANT: Can I know your name please?

USER: Ronald Campbell here.

ASSISTANT: Sorry to say, no flight is available for you. Thank you for reaching us, have a nice day.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: You are welcome.