You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any assistance from us?

USER: Can you book a direct flight to Chicago?

ASSISTANT: That's ok, I will assist you with that. Could you please tell us your airport codes?

USER: My airport codes are from PHL to ORD.

ASSISTANT: Ok, could I know your name please?

USER: Myself Mark Wilson.

ASSISTANT: Ok, please tell me your departure day.

USER: My departure date is 08/30.

ASSISTANT: Ok, please tell me your arrival day.

USER: My return date is 09/01.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no flight on your requested travel dates.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for the information.