You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Evans.

ASSISTANT: How can I aid you?

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

ASSISTANT: Sure, I can help you. 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 your time.

ASSISTANT: Thank you for opting us.