You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Amy Edwards. I would like to change an existing reservation.

ASSISTANT: Sure, I will help you in changing your reservation. Just give a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation on your name in our database.

USER: No issue, thank you for your time.

ASSISTANT: Thank you for opting us.