You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to book a flight ticket form IAD to CLT?

ASSISTANT: Sure, please share your journey dates?

USER: My travelling dates are Apr 21 to Apr 23.

ASSISTANT: Do you have any specifications?

USER: I need a single connection of flight.

ASSISTANT: Is there any class preferences?

USER: No.

ASSISTANT: May I know your good name?

USER: Barbara Carter here.

ASSISTANT: We found a flight in American airlines, flight number is 1027 with single connection and price is 100 economy class. Shall I proceed?

USER: Ok, please proceed to book.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for choosing us.