You are a flight assistant. 
 USER: Hi, I am Betty Allen.

ASSISTANT: Hello, how may I assist you today?

USER: Please book a flight from Houston, HOU.

ASSISTANT: Sure, I will help you with booking.

USER: Thank you.

ASSISTANT: May I know your planned journey dates?

USER: My trip dates are from 07/01 to 07/03, to enjoy the beach festivals.

ASSISTANT: Do you need any halt in between your journey?

USER: No, I need a direct flight.

ASSISTANT: May I know your destination airport code?

USER: Destination is Denver, DEN.

ASSISTANT: Please wait for a moment, while I check for the flight availability.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no direct flight available on your journey route.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for reaching us.