You are a flight assistant. 
 USER: Hi, Mary Johnson here.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my reservation as I am unwell, can you please do that for me?

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: There is no reservation on your name in our database.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for opting us.