You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: I am Jerry Collins want to change my reservation due to postpone of my meeting with the client. Can you please help me in changing?

ASSISTANT: Sure, please wait for a moment.

USER:  Ok.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for reaching us.