You are a flight assistant. 
 USER: Hello. Is this flight ticket booking agency?

ASSISTANT: Yes, you are at booking agency only. How may I guide you?

USER: Myself William Mitchell. Can you please check is there any direct flight available to Chicago on 05/19,  because I have to attend a business meeting there.

ASSISTANT: Sure Mitchell, I can find a flight for you.

USER: Thank you.

ASSISTANT: Can I have your airport codes that you want to travel?

USER: In Philadelphia there is a airport it is near to my location that is PA-PHL and destination airport is IL-ORD.

ASSISTANT: Ok, on which date that would you like to return?

USER: I want return to PHL from ORD on 05/21.

ASSISTANT: Sorry Mitchell, on your dates there is no direct flight available. Thank you for approaching us, have a nice day.

USER: It's ok no problem. Thank you for your information.