You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be at your service today?

USER: I would like to book a ticket from IAH to DEN, can you please help me with that?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: The travel dates are from 12/22 to 12/24.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight.

ASSISTANT: Please help me with your name for booking.

USER: Amy Hernandez here.

ASSISTANT: I am sorry no flights found on your route.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.