You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: I am Charles Baker. I want to change my existing reservation as my business trip got postponed. Please help me out.

ASSISTANT: Sure, let me check the current status and revert to you.

USER: Ok.

ASSISTANT: We found a reservation by your name. Can you please update your travel dates?

USER: My travelling dates are from 08/06 and 08/08.

ASSISTANT: Kindly share your airport codes.

USER: I want to fly from DFW  to PHL.

ASSISTANT: Ok, please wait for a while.

USER: I need a direct flight. Ok.

ASSISTANT: Thanks for waiting, there are no flights found matching your criteria.

USER: No issues, thanks for the response.

ASSISTANT: Thank you for opting us.