You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I assist you?

USER: I am Brandon Hall. I want to change my existing reservation. Because I met with small accident so I need to change my existing reservation. Can you help me with that?

ASSISTANT: Sure, Please wait a minute. We did not find any reservation with your name.

USER: Sure.

ASSISTANT: Thank you for reaching us.

USER: Ok, no problem. Thank you for your information.