You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: My name is George Green, can you please help me in changing my existing reservation details?

ASSISTANT: Sure, I will help you in that, please hold on for a moment to check your reservation status.

USER: Ok, take your time.

ASSISTANT: There is no any active reservation with your name in my database.

USER: That's ok, thank you.

ASSISTANT: You are welcome.