You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Please, provide me your name to check your previous reservation on your name?

USER: I am Andrew Davis.

ASSISTANT: Please, wait a moment.

USER: Ok.

ASSISTANT: Sorry Andrew, no reservation found on your name in our data base.

USER: No problem, thanks for checking.

ASSISTANT: Welcome, thank you for contacting us.