You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I want to attend a conference meeting at Boston. Can you help me to book a flight ticket from LAS to BOS?

ASSISTANT: Sure, We are here to help you. Can I know your trip dates?

USER: Thank you. Apr, 3 and Apr, 5 are my trip dates.

ASSISTANT: Do you need any break?

USER: No, I would prefer direct flight.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: I don't have any specifications more.

ASSISTANT: May I know your name?

USER: Donald Hernandez.

ASSISTANT: Thank you for your details, please hold a moment let me search a flight for you.

USER: Sure.

ASSISTANT:  We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for picking us.