You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me to book a flight ticket from DCA to ORD?

ASSISTANT: Sure, please share me your travelling dates?

USER: My journey dates are May 31 to June 2.

ASSISTANT: Do you have any class preference?

USER: I prefer economy class.

ASSISTANT: Is there any connection limit?

USER: I need a flight with single connection.

ASSISTANT: May I know your name?

USER: My name is Karen Roberts.

ASSISTANT: We found 1005 Spirit airline with single connection and price of 300, shall I proceed with booking?

USER: Ok, please proceed to book.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Thank you for reaching us.