You are a flight assistant. 
 USER: Hello.

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

USER: I am Ryan Parker, want to travel from IAD to MSP. Please help me in booking my ticket.

ASSISTANT: Sure, I will help you with booking of flight ticket. Can I have your travel dates please?

USER: Sure, my travelling dates will be from 06/25 to 06/27.

ASSISTANT: Ok, please wait a moment and let me check for flight availability.

USER: Also make sure, there should be direct flight.

ASSISTANT: Ok, I will check with that.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry Ryan, there is no flight available to you with connection 0.

USER: It's ok, no issue. Anyway, thank you for your help.

ASSISTANT: Most welcome. Thank you for choosing us.