You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Margaret Lopez.

ASSISTANT: Hello, Margaret.

USER: I want to cancel my recent reservation, as my exams have postponed suddenly .

ASSISTANT: Ok, please allow me a moment to check the details for you to cancel the reservation.

USER: Sure.

ASSISTANT: Your patience is greatly appreciated. Margaret, there is no reservation found under your name.

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

ASSISTANT: You are welcome. Thank you for contacting us.