You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Brandon Nelson. Can you help me for changing my existing reservation?

ASSISTANT: Please wait a while.

USER: OK.

ASSISTANT: There is no reservation on your name in our database.

USER: Oh! It's ok no problem, thank you for your services.

ASSISTANT: Thank you for opting us.