You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Christine Johnson. My family tour trip got postponed, so I want to change an existing reservation.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Not an issue.

ASSISTANT: Thanks for reaching us, have a good day.

USER: Thank you.