You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: I am Elizabeth Wright. I would like to change my existing reservation, can you please help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting, no reservation was found on your name to change.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for choosing us.