You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you today?

USER: I want to book a flight ticket with the name Paul Lewis, to visit the historical places at Denver. Help me out with a connecting flight.

ASSISTANT: Sure, when do you want to travel?

USER: My preferred travelling dates are Depart date on 11/04 and return date on 11/06.

ASSISTANT: Ok, help me with your airport codes?

USER: My source point is Charlotte, NC- CLT and destination point is Denver, CO- DEN.

ASSISTANT: Ok, please wait I will get back to you.

USER: I need the ticket within price 500. Ok.

ASSISTANT: Thanks for waiting, we have not found any flights with your specified dates.

USER: Ok, no problem. Thank you for your quality response.

ASSISTANT: Thank you for reaching us.