You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brandon Jones.

ASSISTANT: How can I assist you today?

USER: I want to change my existing reservation due to some health issues, can you help me with that?

ASSISTANT: Sure, I here to help you.

USER: Thank you.

ASSISTANT: Wait a second I will check the status.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.