You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Dennis Brown, want to cancel my ticket, because my friends cancelled the tour due to some problem. So, please help me with it.

ASSISTANT: Sure. Sure, I can help you. Give me a minute.

USER: OK.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: Ok, not an issue. Leave it. Thanks for the information.

ASSISTANT: Thank you for reaching us.