You are a flight assistant. 
 USER: Hello, myself Rebecca Anderson.

ASSISTANT: Hello. How can I guide you at this moment?

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

ASSISTANT: Sure, I will help you with this.

USER: Thank you.

ASSISTANT: Rebecca Anderson, there is no active reservation found under your name in our database.

USER: Not an issue, thank you for checking.

ASSISTANT: Thank you for contacting us.