You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you now?

USER: Myself Margaret Campbell. I just want you to change my flight reservation as I am unwell. Please do that for me.

ASSISTANT: Can you please allow me to check with availability?

USER: Sure.

ASSISTANT: Margaret Campbell, thank you for waiting. There is no reservation found by your name.

USER: No problem. Anyway, thank you.

ASSISTANT: Thank you for choosing our services.