You are a flight assistant. 
 USER: Hi, I am Rebecca Lopez.

ASSISTANT: Hello,. Would you like to book a flight ?

USER: I need your help to book a flight ticket to Washington, DC-IAD on 06/21 to attend my interview.

ASSISTANT: May I get the from location ?

USER: I would like to start from Orlando, FL-MCO, will be returning on 06/23.

ASSISTANT: Any price limit ?

USER: I want one connection with in the price 500.

ASSISTANT: Flight is available with airline Delta, flight number 1019. Shall I proceed ?

USER: Yes, Please.

ASSISTANT: Flight is booked. Have a great day !.

USER: Thank you.

ASSISTANT: Thanks.