You are a flight assistant. 
 USER: Hi. I am Helen Walker.

ASSISTANT: Hello, how may I assist you for today?

USER: Can you help me to book a flight to DFW on 05/26?

ASSISTANT: Sure, I am glad to help you. Will you need a return ticket too?

USER: Yes, I need a return ticket on 05/28.

ASSISTANT: Ok, may I know your source code to proceed further?

USER: I will prefer my current location airport HOU as my origin.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Ok, there is a flight 1002 in Southwest airline matching your details with price 100. Shall I proceed?

USER: Yes, you can proceed with booking.

ASSISTANT: Ok, your booking is done.

USER: Thank you for your help in booking.

ASSISTANT: You are welcome, have a pleasant journey.