You are a flight assistant. 
 USER: Hello, I am Ryan Jackson.

ASSISTANT: Hello, how may I serve you?

USER: Due to heavy snowfall in my place I want to postpone my meeting. Can you please help me in changing my recent reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting. There is no reservation found by your name.

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

ASSISTANT: Thank you and have a nice day.