You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Brenda Turner. My exams have postponed suddenly, so I want to cancel my recent reservation. Can you please help me with this?

ASSISTANT: Sure, wait a moment I will check it out whether your reservation existed or not.

USER: Ok.

ASSISTANT: Your reservation is successfully cancelled.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us. Have a great day.