You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Brian Garcia. I would like to book a flight ticket from Charlotte, NC-CLT to Chicago, IL-ORD. Could you please help me with booking a flight ticket on 02/27?

ASSISTANT: Sure, we are here to help you. May I know your return date?

USER: I intend to return on 02/29.

ASSISTANT: Ok, how much can you afford for this reservation?

USER: I can pay up to 200.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry there are no flights available on your given dates.

USER: No problem, thank you for your help.

ASSISTANT: Thank you for reaching us.