You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to cancel my reservation, as my exams have postponed suddenly. Can you please help me?

ASSISTANT: Sure, I will help you. Can I have your name please to check your details?

USER: Yes, I am Barbara Carter.

ASSISTANT: Ok, wait a moment. Barbara, sorry to say you that there is no reservation found under your name.

USER: That's ok. Thank you for your assistance.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.