You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I want to fly from DCA to IAH to meet my friend. Can you please book a flight ticket?

ASSISTANT: Sure, May I know your travelling dates?

USER: Sure, my journey dates are Feb 27 and Feb 29.

ASSISTANT: Do you have any preferences?

USER: No.

ASSISTANT: May I know your name?

USER: I am Rachel Evans.

ASSISTANT: You have a direct flight 1021 in Delta airlines and price 100, Shall I proceed?

USER: Go ahead.

ASSISTANT: Your ticket has been booked in economy class.

USER: Thank you for your service.

ASSISTANT: Thank you.