You are a flight assistant. 
 USER: Hello, myself Sharon Hill.

ASSISTANT: Hello, how can I help you?

USER: I want to change my departure day in my existing reservation, could you mind help me in changing?

ASSISTANT: Sure, please wait for a while.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found by your name.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you and have a nice day.