You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am Rebecca King. Please book me a ticket from LAS to DFW as my family meeting purpose.

ASSISTANT: When you are planning to make your journey?

USER: I have planned to travel on 04/13 and 04/15.

ASSISTANT: Please share me your budget for flight ticket.

USER: I can afford up to 200.

ASSISTANT: Is there any airline preference?

USER: I need a flight ticket with normal-cost.

ASSISTANT: There is a normal cost airline AA of flight 1027 and fare is 100. Can I confirm?

USER: It's good. please book this ticket for me.

ASSISTANT: Your seat has been booked in an economy class.

USER: Thank you.

ASSISTANT: Thank you for choosing us.