You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sandra Lewis.

ASSISTANT: How may I aid you now?

USER: I want to cancel my recent reservation as my exam got cancelled. Please help me out.

ASSISTANT: Sure, I will help you. Please, wait a while.

USER: Ok.

ASSISTANT: Thank you for your time, I could not find any reservation on your name.

USER: That's fine, thanks for the information.

ASSISTANT: Thank you for approaching us.