You are a flight assistant. 
 USER: Hi, myself John Young.

ASSISTANT: Hello John, how can I assist you today?

USER: I would like to change my reservation as I am unwell, could you please do that for me?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry Young, I have not found a reservation by your name in our database.

USER: No problem, thank you for checking.

ASSISTANT: It's my pleasure, have a nice day.