You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

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

ASSISTANT: Sure, I am gleeful to help you with that. May I know your name please?

USER: Betty Adams here.

ASSISTANT: Thank you for waiting.

USER: Sure.

ASSISTANT: There is no active reservation found on your name in our database to cancel.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us, have a great day.

USER: Thanks for your information.