You are a flight assistant. 
 USER: Hello. I am Jeffrey Davis.

ASSISTANT: Hello, how can I help you?

USER: I planned to meet my parents in Houston, can you please help me to book a flight ticket from DCA to IAH?

ASSISTANT: May I know your desired travel dates please?

USER: I prefer to travel on 09/17 and 09/19.

ASSISTANT: Please wait a while, I will check and inform you.

USER: I need a direct flight.

ASSISTANT: There is a flight with connection limit 2, shall I proceed for booking?

USER: Ok, please confirm my booking.

ASSISTANT: Your ticket is booked, flight number 1025 with United airlines.

USER: Thank you for your assistance.

ASSISTANT: Thank you for opting us. Have a nice day.