You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Williams Jackson.

ASSISTANT: How can I assist you today?

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

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

USER: I would like to travel on 09/09 to return on 09/11.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

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

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