You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I amend you?

USER: Due to health issue, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure. May I know your name?

USER: Patricia Turner here.

ASSISTANT: Wait a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, There is no reservation with your name.

USER: No problem, Thank you.

ASSISTANT: Thank you.