You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am David Smith.

ASSISTANT: How can I render you today?

USER: I need to book a ticket from DFW  with fare of 1000 to Phoenix PHX. Could you please help me in doing that?

ASSISTANT: Sure, we are glad to aid you. When you want to start your trip?

USER: My starting date is 08/21.

ASSISTANT: Let me know what is the budget for my trip.

USER: I already mentioned above.

ASSISTANT: When you will catch the return the flight?

USER: My return date is on  08/23.

ASSISTANT: Thanks for your details. There is a plane 1019 of Southwest airline with a connecting flight. Shall I proceed?

USER: You can proceed with booking.

ASSISTANT: Reservation is done on your name David Smith.

USER: Thank you.

ASSISTANT: Thank you for availing us.