You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: Myself Brandon Wright.

ASSISTANT: Ok.

USER: I need to change my existing reservation, can you please help me.

ASSISTANT: Sure, please let me check.

USER: Sure, take your time.

ASSISTANT: I am sorry, there are no reservation with your name.

USER: Thank you for the information provided.

ASSISTANT: Thank you, have a good day.

USER: You are welcome.