You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. What kind of service are you seeking from us?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, I will help you. May I know your good name please?

USER: Myself Mary Lee.

ASSISTANT: Ok, please hold on. I will revert to you.

USER: Ok.

ASSISTANT: There is no reservation found on your name.

USER: No problem, thanks for checking.

ASSISTANT: Thanks for approaching us, hope to serve you again.