You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I am Andrew Parker. My business meeting was postponed, so I want to change my existing reservation. Could you help me in changing reservation?

ASSISTANT: Sure, please wait for a while I will check and let you know.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, we did not found any reservation on your name.

USER: Not an issue. Thanks for your quick response.

ASSISTANT: Thank you for reaching us.