You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dennis Evans.

ASSISTANT: How may I aid you today?

USER: Can you help me for cancelling my recent reservation, because I am unable to travel at this moment?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your previous reservation.

USER: Ok, I will wait for your reply.

ASSISTANT: Sorry to inform you that, there is no reservation found with your name in our records.

USER: Oh! It's ok, no problem. Thank you for your services.

ASSISTANT: Thank you for reaching us, have a great day.