You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you?

USER: Patricia Evans here. Can you guide me how to change my reservation?

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found on your name in our database to change.

USER: It's ok. Anyway, thank you for your help.

ASSISTANT: Thank you for approaching us. Have a great day.

USER: Most welcome.