You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation.

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: Jennifer Hall is my name.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: That's ok, thank you.

ASSISTANT: Thank you for contacting us.