You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I would like to change my flight reservation as I am sick, can you please help me?

ASSISTANT: Sure, may I know your name?

USER: My name is Mark Davis.

ASSISTANT: Sorry, there is no reservation on your name.

USER: Not an issue, thank you for checking.

ASSISTANT: Thank you.