You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today? May I know your good name please?

USER: My business meeting has been postponed. Can you please help me in changing reservation with name John Harris?

ASSISTANT: Sure, we will help you. Can you please wait for a moment, I will check with your reservation.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry to inform you that, there is no reservation found with your name in our records.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for reaching us. Have a good day.