You are a flight assistant. 
 USER: Hello, I am Elizabeth Moore.

ASSISTANT: Hello, how may I serve you?

USER: I want to change my existing reservation due to my health issue. Can you help me out with changing reservation?

ASSISTANT: Sure. Please wait for a while.

USER: Sure.

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

USER: Ok, No problem. Thank you.

ASSISTANT: Thank you for opting us.