You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Robert Martinez.

ASSISTANT: How can I help you today?

USER: I want to travel from ORD to BOS. Can you book a flight ticket for me?

ASSISTANT: Sure, we are happy to help you. Can you please let e know your travelling dates?

USER: I want to travel in the flight on May 08 and May 10.

ASSISTANT: Do you have any stopover in between journey?

USER: I want to have a connecting flight.

ASSISTANT: May I know your airline specification?

USER: No, but I want to depart in afternoon time.

ASSISTANT: Do you want to travel in an economy class or business class?

USER: I don't have any preference.

ASSISTANT: Thanks for providing details, we are sorry to inform you that no flights are available on your journey routes.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for availing us.