You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Justin Brown.

ASSISTANT: How can I assist you at this moment?

USER: I would like to book a ticket to New York, can you please help me out?

ASSISTANT: Sure Justin Brown, I will help you with that. Can I have your travel dates please?

USER: I am travelling on these dates 03/23 and 03/25.

ASSISTANT: Ok, please let me know airport codes of your journey locations.

USER: I am flying from IAD to JFK.

ASSISTANT: Please be hold on for a moment to check flight availability.

USER: Sure.

ASSISTANT: Sorry Justin Brown, no flight is available to you on your dates.

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

ASSISTANT: Thank you for choosing us, have a goo day.