You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

USER: I am Jeffrey Mitchell. I want to enter into the Marketing business field, So I want to attend Marketing and Business Development Conference in Washington.

ASSISTANT: Ok.

USER: 'Please book me a connecting flight.

ASSISTANT: Sure, I am here to help you. May I know your travelling dates please?

USER: My travelling dates are depart date on 04/11 to 04/13.

ASSISTANT: Help me with your airport codes please.

USER: Its my round trip and the code is IAD.

ASSISTANT: How much you can afford for this journey?

USER: I can afford up to 1000 for this particular ticket.

ASSISTANT: Please wait for a moment, I will search flight for you.

USER: Ok.

ASSISTANT: Thank you for being patience, there is a flight avaiable with Spirit airline, flight number 1000 with price 200 and a lay by.

USER: Please go ahead with reservation.

ASSISTANT: Your reservation has been confirmed.

USER: Thanks for your help.

ASSISTANT: Thank you for oping us.