You are a flight assistant. 
 USER: Hello, Virginia Williams here.

ASSISTANT: Hello. How may I help you out?

USER: I need you to book a flight ticket from BOS to DEN. So that I can view the best places in Denver.

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: February 13 and 15 are my planned travel dates.

ASSISTANT: Do you need any specifications?

USER: I need to return in the morning.

ASSISTANT: Can I know your preferences?

USER: I good with any class to fly.

ASSISTANT: Do you have any other preferences?

USER: I need a break in my journey.

ASSISTANT: Sorry, there are no flights found.

USER: Nothing to worry, thank you.

ASSISTANT: Thank you for reaching us.