You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Alexander Mitchell.

ASSISTANT: How can I help you today?

USER: Can you help me in booking from LAS to BOS, as there is a business meeting to attend?

ASSISTANT: Sure, I am happy to help you to book the ticket. May I know your planned trip dates?

USER: My trip dates are Feb 25 to Feb 27.

ASSISTANT: Ok, how many halts do you prefer in between your journey?

USER: I need a connecting flight which depart at afternoon.

ASSISTANT: Ok, which airlines do you prefer to travel?

USER: I am ok with any airline.

ASSISTANT: Sorry to inform you that, there is no flight found which is departing in the afternoon time on the dates you have given.

USER: No issue, thank you.

ASSISTANT: My pleasure, thank you for approaching us.