You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am Samantha Adams. Can you help me in booking my flight ticket from Denver CO-DEN to Seattle WA-SEA?

ASSISTANT: Sure, please let me know if you need a connecting flight or a direct flight.

USER: I need a direct flight.

ASSISTANT: On what dates you want me to make the reservation?

USER: Please reserve my flight ticket from 12/29 to 12/31.

ASSISTANT: Ok, let me check the availability and revert to you.

USER: Sure.

ASSISTANT: Thanks for providing your details. Currently there are no flights going on your route.

USER: Ok, thank you for your effort.

ASSISTANT: Thank you for picking us.