You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I am planning to attend music concert at BOS, can you please help me with booking a flight ticket from LAS?

ASSISTANT: Sure, let me know your trip dates please?

USER: I would like to take off on Nov 19 and return on Nov 21.

ASSISTANT: Is there any airline preference?

USER: No, I am looking for a connecting flight.

ASSISTANT: Any other requirement to be met?

USER: I prefer business class.

ASSISTANT: Can you share your name to proceed further?

USER: My name is Nicole Williams.

ASSISTANT: Sorry, no flights found as per your requirements.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.