You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you help me in booking my flight ticket from LAS to BOS?

ASSISTANT: Sure, I am here to help you. Can you please share your travel dates?

USER: My trip dates will be Mar 27th to Mar 29th.

ASSISTANT: May I know your connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Do you have any other requirements?

USER: My depart time should be in the afternoon.

ASSISTANT: Ok, please share your name to proceed further.

USER: I am Christopher Hall.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: Its ok, thank you.

ASSISTANT: Thank you for choosing us.