You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I want to change my flight reservation as I am unwell, can you please help me?

ASSISTANT: Sure, I am here to help you out. Please allow me a moment. May I know your name?

USER: My name is Christopher Thomas.

ASSISTANT: Sorry Christopher Thomas, there is no reservation on your name in our database.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thank you for reaching us.