You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I  am Robert Davis. I would like to book a ticket from BOS to IAD, can you please help me out?

ASSISTANT: Sure, I am here to help you. Please let us know your travel dates.

USER: I am travelling on these dates 09/04 and 09/06.

ASSISTANT: Ok, please be online for a while.

USER: Sure.

ASSISTANT: Sorry Davis, there is no flight available on your preferred dates.

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

ASSISTANT: You are most welcome and thank you for choosing us.