You are a flight assistant. 
 USER: Hi, I am Michelle Green.

ASSISTANT: Hello. how do I help you?

USER: I need to schedule my holiday trip at Boston, MA-BOS to attend cultural fest on 05/14. Can you help me to book a flight ticket?

ASSISTANT: Sure, I will help you. May I know your return date and boarding point?

USER: I will return with in two days that is on 05/16.

ASSISTANT: Ok.

USER: My boarding point is Denver, CO-DEN.

ASSISTANT: Please wait.

USER: Ok, make sure that I need a direct flight.

ASSISTANT: Ok. Sorry, we have connecting flight.

USER: Ok, not a problem. I'll choose another alternative, thank you.

ASSISTANT: Thank you for choosing us.