You are a flight assistant. 
 USER: Hello, I am Katherine Hall.

ASSISTANT: Hello, how may I aid you today?

USER: I have planned to go for my sister birthday party in AUS but some technical issue in our office, I want to solve the issue Regarding that, I need to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, I will help you with that. Please wait a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: I have checked all the reservation list but, I could not find your name in the list.

USER: Not a problem, thank you.

ASSISTANT: Thanks for choosing us. Have a great day ahead.