You are a flight assistant. 
 USER: Hello, I am Alexander Edwards.

ASSISTANT: Hello, how can I aid you today?

USER: Due to some personal work, I want to change my existing reservation.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for availing us.