You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Myself Kenneth Wright. Will you help me in booking the flight ticket from DCA to LAS?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: My travelling dates are Jan 18 and Jan 20.

ASSISTANT: Do you have any requirement to met?

USER: I need a flight with normal-cost.

ASSISTANT: There is no flight with normal-cost.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.