You are a flight assistant. 
 USER: Hi, I am Carolyn Campbell.

ASSISTANT: Hello, how may I assist you?

USER: I want to cancel my recent reservation due to my grandmother's sudden health problem.

ASSISTANT: We have found a reservation. Shall I cancel it?

USER: Yes, please.

ASSISTANT: Ok, your reservation has been canceled.

USER: Thanks for you assistance and valuable time.

ASSISTANT: Thanks for opting us.