You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Please help me to book a flight ticket from ORD to DFW?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: My journey dates are Aug 21 and Aug 23.

ASSISTANT: Do you have any preferences?

USER: I prefer a return time at morning.

ASSISTANT: May I know your name please?

USER: I am David Smith.

ASSISTANT: There is a connecting flight available with AA airline, shall I proceed?

USER: Yes, you can.

ASSISTANT: Your booking is done with flight number 1017. Happy journey.

USER: Thank you for your help.

ASSISTANT: You are welcome, have a nice day.