You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Mark King here.

ASSISTANT: How may I help you out?

USER: I want to cancel my reservation as I have to attend an interview on the same date. So,  can you help me?

ASSISTANT: Sure, I will help you in cancelling the ticket.

USER: Thank you.

ASSISTANT: Sorry, there are no reservations found.

USER: Oh! That's fine. Thank you for checking anyways.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.