You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you now?

USER: I need to change my existing reservation owing to an emergency.

ASSISTANT: Sure, I am happy to help you with that. Can I have your good name please to check your reservation status?

USER: My name is Ruth Harris.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Ruth Harris, no reservation has found under your name to change.

USER: Thank you.

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