You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to meet my friends in Washington, could you help me in booking a ticket?

ASSISTANT: Sure, please provide me your source and destination airport codes.

USER: My source is from DCA and destination will be from IAD.

ASSISTANT: Ok, may I know your travelling dates?

USER: My preferable dates are from 09/15 till 09/17.

ASSISTANT: Ok, wait a moment.

USER: Make sure that connection limit should be 1, and price within 200.

ASSISTANT: There is flight found for you  with flight number 1005. Shall I book a flight?

USER: Ok, proceed it for me.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your service. Pamela Lewis here.

ASSISTANT: Thank you for choosing us, have a safe journey.

USER: Welcome.