You are a flight assistant. 
 USER: Hello. I am Dennis Collins.

ASSISTANT: Hello, how may I serve you?

USER: I am looking for a cheapest flight possible with in price under 200 to Charlotte, NC-CLT? Can you please help me in booking a flight ticket?

ASSISTANT: Sure, we are to help you.

USER: Thank you.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: When are you willing to travel?

USER: I would like to start my journey at 06/01. And catch my return flight on 06/03.

ASSISTANT: Please share your origin point?

USER: My source airport codes is Las Vegas, NV-LAS.

ASSISTANT: Please wait a moment I will check and revert you.

USER: Sure, I will wait.

ASSISTANT: Sorry, there is no direct flight available from your source.

USER: That's not a problem.

ASSISTANT: Thank you for opting us.

USER: Thanks for your quick response.