You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am Robert Taylor. I want to book a flight ticket from ORD to BOS. Can you make a reservation for me?

ASSISTANT: On which dates you are willing to travel?

USER: Sure, my planned trip dates are on Jan 03 and return on Jan 05.

ASSISTANT: Do you have any other specifications?

USER: Yes, I want to depart in the evening.

ASSISTANT: Sorry, there is no flight for you on your route.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thanks for choosing us, have a good day.