You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I aid you at this moment?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, may I know on which name the ticket has been reserved?

USER: I am Scott Garcia.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to notify you, there is no active reservation found on your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.