You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Brenda Brown. I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there was no active reservation found on your name.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.