You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to some personal work, I want to change my existing reservation. Can you please change my reservation?

ASSISTANT: Sure, may I know your name please?

USER: Sure, I am Stephanie Martinez.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, no reservation was found on your name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for choosing us.