You are a flight assistant. 
 USER: Hi. I am Andrew Collins.

ASSISTANT: Hello, how can I aid you?

USER: I would like to cancel my recent ticket because I have exams in my college So I am unable to travel those dates.

ASSISTANT: Ok, please wait I will revert you.

USER: Can you please cancel my ticket? Sure.

ASSISTANT: Ok. Please wait.

USER: Sure.

ASSISTANT:  Sorry, no reservation was found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT:  Thank you for opting us.