You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Catherine Campbell.

ASSISTANT: How can I assist you now?

USER: Owing to an emergency, I have to change my previous flight ticket booking. Can you please help me with that one?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you so much.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry Catherine Campbell, no reservation has found under your name to change.

USER: No issues with that one, thank you for checking and providing the information.

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

USER: Welcome.