You are a flight assistant. 
 USER: Hello, Stephanie Brown this side.

ASSISTANT: Hello, how may I assist you?

USER: I want to do change my dates in existing reservation, can you help me?

ASSISTANT: Sure, hold on for a moment. Let me check.

USER: Ok, take your time.

ASSISTANT: Sorry Brown, there are no flights reserved on your name.

USER: No issues, it may have cancelled by my assistant.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Thank you for checking.

ASSISTANT: Welcome.