You are a flight assistant. 
 USER: Hello, I am Sharon smith.

ASSISTANT: Hello, how can I assist you?

USER: As my schedule of attending an guest appearance for an shop opening got cancelled. Can you please help me in changing my existing reservation?

ASSISTANT: OK, please wait for a minute, let me check and revert you.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation with your name.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you, for reaching us.