You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I address you?

USER: I want to change my existing reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure, please provide your name to fetch from our database.

USER: My name is Rachel Hall.

ASSISTANT: Wait for a moment.

USER: Sure.

ASSISTANT: We regret to inform you that there is no active reservation found on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for contacting us.