You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Please book a flight ticket from LAS to BOS to attend for an interview.

ASSISTANT: Sure, May I know your travelling dates?

USER: My travelling dates are 20 and 22 on the month of Dec.

ASSISTANT: Do you have any connection limit?

USER: I need a connected flight.

ASSISTANT: Is there any airline preference?

USER: Yes, I would like to fly in normal cost airline.

ASSISTANT: May I know your name?

USER: Sure, my name is Stephanie Lewis.

ASSISTANT: Thanks for your details, there are no flights found on your data.

USER: Ok, thanks for your response.

ASSISTANT: Thank you.