You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Need your assistance for booking to CLT with a direct flight on the name of Mary Clark.

ASSISTANT: Sure, May I know your source?

USER: Sure, my source is LAS.

ASSISTANT: Ok, Kindly mention your scheduled dates.

USER: My journey dates are 18 June and 20 June.

ASSISTANT: Ok, Do you have any airline preference?

USER: No.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, we did not find any flights with your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.