You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: On my semester exams I am unable to attend the trip which my friend's has planned, so, can you cancel my ticket reservation?

ASSISTANT: Sure, may I know your name please?

USER: I am Jennifer Green.

ASSISTANT: Sorry Green, no reservation has been found on your name in our database.

USER: It's ok. Thank you for your help.

ASSISTANT: Thank you for contacting us, all the best for your exam.