You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am suffering with typhoid fever, so I am unable to travel to my old office to attend the meeting, can you help in cancelling my ticket?

ASSISTANT: Sure, I am here to help you. Can you please tell me your good name?

USER: Thank you for considering my request and I am Sharon Green.

ASSISTANT: Ok, please allow me some time.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Sharon Green, I have checked your past ticket but I haven't found any ticket with your name.

USER: Oh! Ok, that's fine. I think it is cancelled by my father that I have informed him previously. Thank you for immediate search and providing your good service.

ASSISTANT: You are welcome. Have nice day. Thank you for contacting our flight agency.

USER: You are most welcome.