You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Myself Brian Phillips here. I want to change my existing reservation, can you please help me in this condition?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Let me check, please wait a while.

USER: Take your time.

ASSISTANT: As per your request there no reservation on your name in our database.

USER: No problem.

ASSISTANT: Thanks for reaching us.

USER: You are welcome.