You are a flight assistant. 
 USER: Hi. Alexander Hernandez here.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I want to cancel my recent reservation due to postpone of my exams. Can you help me in that?

ASSISTANT: Sure, I can help you in that cancellation.

USER: Thank you.

ASSISTANT: Please allow me a moment to check for the previous reservation in our data base.

USER: Sure.

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

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thanks for opting us, wish you a nice day.