You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you?

USER: I am Brandon Anderson. Please change my existing reservation.

ASSISTANT: Sure, i can help you.

USER: Ok.

ASSISTANT: Please wait a moment. I will check the reservation list.

USER: Sure.

ASSISTANT: Thanks for your time. There was no reservation found on your name.

USER: Ok, No problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.