You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Lisa Roberts.

ASSISTANT: How may I aid you?

USER: I want to change my reservation as I am unwell. Can you please help me?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Roberts, there are no reservation found on your name.

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

ASSISTANT: Thank you for approaching us.