You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brain Lewis.

ASSISTANT: May I know, what kind of service you are expecting from our side?

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

ASSISTANT: Sure, I can help you in booking.

USER: Thank you.

ASSISTANT: Can you mention, On what dates you need to travel to PHX and return from there?

USER: I would like to travel on 11/22 to 11/24.

ASSISTANT: Sorry Brain Lewis, there are no flights found on your travel dates for your journey.

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

ASSISTANT: Thanks for approaching us.