You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I want to cancel my recent reservation in the name of David Lewis. C an you help me in this?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry we did not find any reservation with your name.

USER: It's ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.