You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you today?

USER: I need to change an existing reservation due to some  health issues. Can you please help me?

ASSISTANT: Sure. May I know your good name?

USER: I am Linda Davis.

ASSISTANT: Please, wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for opting us.