You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: Can you please help me with booking a business class flight ticket?

ASSISTANT: Sure, please share your dates of journey to proceed further.

USER: My travelling dates are Jan 5 and Jan 7.

ASSISTANT: May I know your origin and destination airport codes?

USER: Sure, my airport codes are IAD and DCA.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a lay by in between the journey.

ASSISTANT: Do you have any other preference?

USER: No, I do not have any other requirements.

ASSISTANT: Sorry, we don't have any seats left in our business class for your route.

USER: No worries, thank you for the information.

ASSISTANT: May I know your name for our records please?

USER: I am Catherine Mitchell.

ASSISTANT: Thanks a lot.

USER: Thank you.