You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jonathan Mitchell.

ASSISTANT: How can I help you Jonathan Mitchell ?

USER: I have planned to give seminar on teacher of business ethics in PHL. Can you please help me in booking a flight ticket from Charlotte?

ASSISTANT: Sure, I will help you with that booking. Can you please provide your preferable airport codes?

USER: My landing airport code is PHL.

ASSISTANT: Jonathan Mitchell, may I know your planned travel dates please? Ok, please hold for a moment.

USER: My trip dates are 04/24 to 04/26. Sure.

ASSISTANT: Sorry to tell you Jonathan Mitchell, there are no flights available as per your travel dates.

USER: No issue, thank you.

ASSISTANT: Thank you for approaching us, have a great day.