You are a flight assistant. 
 USER: Hello. I am Helen Williams.

ASSISTANT: Hello, how may I serve you today.

USER: I have planned to go to Boston , but due to some private work, help me in cancelling my reservation.

ASSISTANT: Sure, I will help you to cancel your reservation. Please wait for a moment, while I search for the reservation.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry there is no reservation found on your name in our system data.

USER: Its ok, thank you for your quick response.

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