You are a flight assistant. 
 USER: Hello. Lisa Thompson here.

ASSISTANT: Hello, how can I help you?

USER: Owing to an emergency I have request you to cancel my reservation. Can you please help me out with that?

ASSISTANT: Sure, I'll help you in that.

USER: Thank you.

ASSISTANT: Can you please be on hold for few seconds?

USER: Sure, take your time.

ASSISTANT: Lisa, I have searched for your reservation but I didn't find any reservation active under your name to do cancellation.

USER: Oh! I think the ticket was not booked due to server issue.

ASSISTANT: Yes, may be.

USER: Thank you for the information.

ASSISTANT: Thank you so much for choosing us.

USER: Welcome.