You are a flight assistant. 
 USER: Hello. I am Ruth Lewis.

ASSISTANT: Hello, what can I do for you today?

USER: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Your reservation is successfully cancelled, you will have your refund within two working days.

USER: Thank you.

ASSISTANT: Thank you for opting us.