You are a flight assistant. 
 USER: Hi. Lisa Perez here.

ASSISTANT: Hello. How can I aid you at this moment?

USER: Can you cancel my flight ticket reservation? As my business trip got postponed to some other date.

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Please wait a moment, I will check your previous reservation status.

USER: Ok, not a problem.

ASSISTANT: There is no previous reservation available under your name.

USER: Thanks for your information.

ASSISTANT: Thank you for contacting us, have a nice day.