You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Myself Brandon Roberts. I want to change my existing reservation, can you help me in that?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Wait a second I will check the update.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to inform you that there is no reservation found in our database with your name.

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

ASSISTANT: Thank you for opting us.