You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: I am Samantha Miller. Can you please change my existing reservation? Becauase I am shifting my food court to other place.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: Ok. Thank you.

ASSISTANT: Thanks for opting us.