You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Raymond Miller.

ASSISTANT: How can I assist you today?

USER: Can you please help me in booking my flight ticket from DEN to LAS?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travelling dates are Mar 22 and Mar 24.

ASSISTANT: Do you have any specifications?

USER: I need direct flight.

ASSISTANT: Please give me a moment.

USER: Ok, sure.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details. Thanks for reaching us, have a great day.

USER: Ok, fine thank you for checking.

ASSISTANT: Welcome.