You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, I will help you with that. Could you send me your full name?

USER: Myself Debra Davis.

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

USER: No problem, thanks for checking.

ASSISTANT: Thank you for approaching us.