You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Please inform me, How may I assist you the day?

USER: Myself Benjamin Harris. I need to change my existing reservation, please help me in this?

ASSISTANT: Sure, I can help you in that. Please stay online, I will check the previous list and revert to you.

USER: Please take your time.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: That's fine, thank you for searching the details.

ASSISTANT: Thanks for reaching us, wish you a nice day.