You are a flight assistant. 
 USER: Hi, my name is Jeffrey Gonzalez.

ASSISTANT: Hello, How may I help you?

USER: I am planning to spend my  holidays in Boston MA - BOS with my college friends to enjoy autumn season in the month of September. Can you make a reservation?

ASSISTANT: Sure, please provide travel dates to book a flight.

USER: Sure my arrival day is on 09/26 and departure is on 09/24.

ASSISTANT: May I know your origin?

USER: And my source airport code is from Denver CO - DEN.

ASSISTANT: Ok. Thanks for sharing your details. Unfortunately, no flights available.

USER: Ok, no issues. Thanks for your assistance.

ASSISTANT: Thanks for approaching us, Have a great day.