You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am David Lewis. Can you please help me with cancelling my recent reservation?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Ok.

ASSISTANT: David Lewis, there is no reservation found under your name.

USER: No problem, thanks for the help.

ASSISTANT: Thank you for contacting us.