You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be there for you?

USER: I am Mary Parker. I would like to attend a pioneer festival at Denver, DEN so, can you book a ticket from Washington, IAD?

ASSISTANT: Sure, when are you planning to travel?

USER: I have planned to travel on 04/19 and return on 04/21.

ASSISTANT: Do you need a lay by?

USER: Yes, I need a lay by.

ASSISTANT: AA airline with flight number 1020 is going on your route and the fare is 100. Shall I proceed?

USER: Yes, proceed.

ASSISTANT: Your reservation has been done.

USER: Thank you for your assistance.

ASSISTANT: Thank you for opting us.