You are a flight assistant. 
 USER: Hello.

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

USER: Please help me in booking a flight ticket from DEN to IAH.

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

USER: My travel dates are July, 1 and July, 3.

ASSISTANT: Do you have any other specifications?

USER: I need direct flight.

ASSISTANT: Please help me with your name for booking.

USER: Rebecca Hernandez here.

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

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.