You are a flight assistant. 
 USER: Hello, Donald Thompson here.

ASSISTANT: Hello, how can I give assistance to you?

USER: Due to my earlier reservation unknowingly  the wrong dates can be mentioned so, I want to change my recent reservation. Ok, don't change it, please cancel my reservation. Can you please help me with cancellation?

ASSISTANT: Ok, I will help you. Please wait a minute.

USER: Sure.

ASSISTANT: Your ticket has been cancelled.

USER: Thank you.

ASSISTANT: We will refund your money soon to your wallet. Thank you.

USER: Thanks for your information.