You are a flight assistant. 
 USER: Hello,. I am Nancy Nelson.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I want to book a flight ticket to visit beach festival at Boston, please help me with a connecting flight.

ASSISTANT: Ok, I will help you. Do you have price limit?

USER: I need the ticket within price 5000.

ASSISTANT: Let me know your trip dates please.

USER: My travelling dates are from 11/21 to 11/23.

ASSISTANT: Help me with your boarding and landing airport codes.

USER: I want to fly from IAD to BOS.

ASSISTANT: Please, wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, there is a flight available with Delta airline, flight number 1003 with fare 200 and a lay by.

USER: Please go with booking.

ASSISTANT: Your reservation has been successfully done.

USER: Thank you.

ASSISTANT: Thank you for availing us.