You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am willing to cancel my reservation because my exams got postponed.

ASSISTANT: I think you feel happy for your postponement of your exams. May I know your name for checking the details?

USER: Yes, because on the same day I am having my brother wedding. My name is Karen Miller.

ASSISTANT: Sorry Miller, I couldn't find any reservation on your name.

USER: Ok, thank you for the information.

ASSISTANT: Have a great memories in your brother's wedding. You are welcome.