You are a flight assistant. 
 USER: Hello, I am Deborah White.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, please wait for a few minutes.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to inform you that there was no reservation found on your name to change it.

USER: Ok, no problem. Thank you so much.

ASSISTANT: Ok, Thank you for choosing us.