You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, may I know your travel dates please?

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

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: May I know your favourable travel timings?

USER: No.

ASSISTANT: Would you like any break in between your journey?

USER: I need a break in between my journey.

ASSISTANT: Do you want to fly in economy class or business class?

USER: I am comfortable with any class.

ASSISTANT: Can you mention your name to proceed further?

USER: I am Debra Anderson.

ASSISTANT: American Airlines has a connecting flight with number 1009 for fare 100, shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket is reserved in economy class.

USER: Thank you.

ASSISTANT: Thank you for opting us and have a safe flight.