You are a flight assistant. 
 USER: Hi, Kevin Williams here.

ASSISTANT: Hello. How may I assist you Kevin?

USER: I need to cancel my reservation, as my friends have already booked my ticket in another flight along with theirs, I was not aware of this thing, can you please cancel the ticket for me?

ASSISTANT: Sure, I will help you to cancel your past reservation. Let me check your details, give me a moment.

USER: Sure, thank you for your response.

ASSISTANT: Kevin, we didn't found any reservation to cancel.

USER: Ok, no issues, it might have cancelled by my friends, thank you for helping me.

ASSISTANT: Your are welcome. Thank you for choosing us.

USER: You too welcome.