You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Due to heavy rain, I want to cancel my reservation. Can you help me?

ASSISTANT: Sure, we are here to assist you. May I know your name?

USER: Donald Lee here.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: We cancelled your reservation successfully.

USER: No problem, Thank you.

ASSISTANT: Thank you for opting us.