You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Larry Edwards here. Can you help me to change my recent reservation because of some personal work?

ASSISTANT: Sure, I will help you.

USER: Thank you.

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

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for opting us.