You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I best serve you today?

USER: I am Andrew Edwards. I just want to cancel my recent reservation, due to my scheduled examination dates has been cancelled.

ASSISTANT: Ok. I will help you on cancelling your reservation.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Your ticket is cancelled successfully.

USER: Thank you.

ASSISTANT: Thank you for communicating with us.