You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Dennis Davis here.

ASSISTANT: David, how may I help you?

USER: Please help me out in cancelling my recent reservation.

ASSISTANT: Sure, please hold on.

USER: Sure, check it I will wait.

ASSISTANT: Sorry, no reservation is available by your name.

USER: Its ok, no issues. Thank you for your information.

ASSISTANT: Thank you for contacting us.