You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to visit Washington to meet my friend, please help me in booking a ticket.

ASSISTANT: Ok,  will assist you.

USER: Thank you.

ASSISTANT: May I know your travel airport codes?

USER: My airport codes are BOS and DCA.

ASSISTANT: Ok, please can you help with your travel dates, so I can check?

USER: My trip dates are 02/16 and 02/18.

ASSISTANT: Ok, there is a connecting flight available and the price of the ticket is 100. On who's name to you want me to book?

USER: Ok, please book the ticket with the name Carol Evans.

ASSISTANT: Ok, the booking is done successfully. The flight number is 1027.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing our service. Have a safe journey.