You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I would like to change my existing reservation due to cancel of my conference. Could you please help me?

ASSISTANT: Sure, we are glad to help you. Please provide your good name.

USER: I am Frank Mitchell.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for opting us.