You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to amend my existing reservation, can you please help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Sure, my name is Angela King here.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for choosing us.