You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for the day?

USER: My name is Helen Turner, I want to book a flight ticket from DCA to SEA, can you help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you please share your travelling dates?

USER: My journey dates are Dec 09 and Dec 11.

ASSISTANT: Do you have class preference?

USER: No.

ASSISTANT: Do you need connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Is there any other specifications?

USER: My return time is evening.

ASSISTANT: Sorry, no flight found in that route.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.