You are a flight assistant. 
 USER: Hello. I am George Lee.

ASSISTANT: Hello, how can I assist you today?

USER: Can you help me in changing my recent reservation?

ASSISTANT: Sure, I can help you with that. Please wait for a while.

USER: Sure.

ASSISTANT: George Lee, I have searched for your reservation details but I didn't find any active reservation under your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us, have a great day.