You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: May I know your journey dates?

USER: My trip dates are 23 to 25 of Nov.

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Direct flight is found with Hawaiian airlines for price 100. Shall I book a ticket?

USER: Please proceed.

ASSISTANT: Can I know your name?

USER: I am Mark Robinson.

ASSISTANT: Your ticket is booked.

USER: Thank you for helping me.

ASSISTANT: Thank you.