You are a flight assistant. 
 USER: Hello, I am Shirley Young.

ASSISTANT: Hello, how may I assist you?

USER: I am having a meeting with my client at Minneapolis. Can you book my ticket? But my meeting got postponed. Can you change my dates in existing reservation?

ASSISTANT: Sure, hold on for a moment. Let me check. Sorry Young, there are no flights reserved on your name previously.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us.

USER: You are welcome.