You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I just need some help in cancelling my existing reservation.

ASSISTANT: Sure, may I know your name?

USER: I am Ruth Nelson.

ASSISTANT: Ok, wait for a minute, so that I will check the reservation.

USER: Ok.

ASSISTANT: Sorry Ruth, no reservation found on your name.

USER: It's ok, thank you for your service.

ASSISTANT: Thank you for contacting  us.