You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I aid you?

USER: I am Sharon Smith. I want to reschedule my reservation as my appointment got preponed. Can you help me in changing?

ASSISTANT: Sure, please wait for a minute I will revert you with present status.

USER: Ok.

ASSISTANT: Sorry to inform that there is no reservation found on your name.

USER: Ok, no issues. Thank you for your quick response.

ASSISTANT: Thank you for reaching us.