You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ronald King.

ASSISTANT: How can I serve you?

USER: As my exam is postponed, I want to cancel my reservation. Can you help me?

ASSISTANT: Sure, I can help you with that. Please wait a while.

USER: Ok.

ASSISTANT: Thanks for being waiting. We didn't found any reservation by this name.

USER: No issue, thank you for checking.

ASSISTANT: Thank you for opting us.