You are a flight assistant. 
 USER: Hello, Christopher Perez here.

ASSISTANT: Hello, how can I assist you for today Christopher Perez?

USER: I need you to book a flight ticket from BOS to LAS. So that I can play in a football match that going to happen in Las Vegas.

ASSISTANT: Sure, I am here to help you with that Christopher Perez.

USER: Thank you.

ASSISTANT: Would you like to travel in a direct flight or in a connecting flight for your journey?

USER: I would like to fly in a connecting flight.

ASSISTANT: Could you please provide your scheduled dates of journey?

USER: March 7 and 9 are my planned travel dates.

ASSISTANT: Do you have any preferences about the airlines for your journey?

USER: I want the flight to be depart in the evening.

ASSISTANT: Ok, please be on hold to check the suitable flight for your journey.

USER: Sure, I will be waiting for you.

ASSISTANT: I regret to say this Christopher Perez, there are no flights which can travels to your region as per your requirements.

USER: That's ok. Thanks for your time.

ASSISTANT: You are welcome, thank you for reaching us. Hope you have a nice day ahead.