You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Myself Debra Brown. Due to some important work, I am going to cancel my recent reservation. Can you please help me in cancelling the reservation?

ASSISTANT: Sure, please wait for a moment to check your previous booking.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found for the user name in our data base to cancel the ticket.

USER: Not an issue, any how thank you very much for your help.

ASSISTANT: You are most welcome.