You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ryan Martinez from SFO.

ASSISTANT: Welcome to Global flight ticket booking agency.

USER: Thank you.

ASSISTANT: How can I help you Ryan?

USER: I would like to visit PHL to attend a business meeting, can you make a reservation for me?

ASSISTANT: Sure, I will help you. May I know your preferable travel dates for booking flight ticket?

USER: My travel dates are 08/12 and 08/14.

ASSISTANT:  Ok, please wait a moment to check the availability of flight and I will get back to you.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, no flights available as per your requested dates.

USER: It's ok.

ASSISTANT: Do you want to know any thing else from us?

USER: No, thanks.

ASSISTANT: Thank you for contacting us, have a good day.