You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can 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: Can I know your name please?

USER: Christine Carter is my name.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.