You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, may I know your name?

USER: My name is Mark Anderson.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found with your name.

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

ASSISTANT: Thanks for reaching us.