You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I would like to book a ticket from ORD to SEA, can you please help me out?

ASSISTANT: sure, I am happy to help you with that.  Can I have your travel dates please?

USER: I am travelling on these dates May 28th and 30th.

ASSISTANT: Ok, please let me know the preferences that you have.

USER: I need single connected flight. I don't have any other preferences.

ASSISTANT: Can I have your good name please to proceed further?

USER: Mary Martin here.

ASSISTANT: Sorry to inform you that no flight is available to you on your dates/.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you choosing us, have a good day.