You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Welcome to Austin airline agency. How can I assist you today?

USER: I want to change my existing reservation, because of some business meeting problems. Can you please help me in this?

ASSISTANT: Sure, will you provide your name please?

USER: Sure, I'm Ruth King here.

ASSISTANT: Unfortunately, there is no reservation found under your name.

USER: Ok, no problem.

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

USER: Thank you for your service.