You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Can I know your travel dates?

USER: I prefer to travel on Apr 17 and Apr 19.

ASSISTANT: Do you have any preference?

USER: I prefer to travel in direct flight.

ASSISTANT: Let me know your name.

USER: I am Carolyn Garcia.

ASSISTANT: Found flight with Southwest airlines for price 200.

USER: Ok, please confirm my booking.

ASSISTANT: Your ticket is booked in an economy class having flight number 1001.

USER: Thank you for your help.

ASSISTANT: Thank you.