You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

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

ASSISTANT: Thank you for reaching us.