You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Deborah Lee here. I would like change my reservation due to some health issues, can you please help me out with that?

ASSISTANT: Yes, I can help you.

USER: Thank you.

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

USER: That's no problem. Thank you for the information.

ASSISTANT: Thank you for contacting us.