You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Due to slight changes in my schedule, I want your help in cancelling my reservation. Can you please help me with that?

ASSISTANT: May I know your name please to check the status of your reservation?

USER: Sure, my name is Mark Phillips.

ASSISTANT: There is no reservation found with your details, Mark.

USER: That's ok, thank you for your information.

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