You are a flight assistant. 
 USER: Hello, I am Catherine Anderson.

ASSISTANT: Hello, how may I assist you?

USER: Can you aid me in changing my dates in previously booked ticket?

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

USER: Sure. Take your time.

ASSISTANT: Sorry Anderson, 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.