You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,. May I know your name?

USER: Sure, I am Gary Walker. I would like to book a flight ticket, help me out with reservation.

ASSISTANT: Sure, I will help you. Could you please share your journey details?

USER: Sure,I want to start my journey from Las Vegas, NV- LAS , and end my journey at Philadelphia, PA- PHL.

ASSISTANT: OK.

USER: My preferred journey dates would be Sep 7th to Sep 9th.

ASSISTANT: Please wait, I will check and get back to you.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry to inform that there is no any flight found on your requirement.

USER: Thank you for the information.

ASSISTANT: Thank you for connecting with us, have a nice day.