You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I provide assistance for you?

USER: I would like to meet my college friend at Washington, please help me in booking a ticket from AUS to IAD.

ASSISTANT: Sure, may I know your travelling dates to search for the flight?

USER: My planned travel dates are on Oct 14 and Oct 16.

ASSISTANT: Do you have any requirements?

USER: I prefer normal-cost airline.

ASSISTANT: Can I know your airline preferences?

USER: I have already mentioned.

ASSISTANT: May I know your connection limit?

USER: I do not have any connection limit.

ASSISTANT: There is a direct flight 1028 of Delta airlines, can I proceed?

USER: Ok, please proceed for booking.

ASSISTANT: May I know your name?

USER: My name is Steven Allen.

ASSISTANT: Your booking is done in economy class.

USER: Thank you for your help.

ASSISTANT: Welcome.