You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I want to travel from IAD to LAS, please help me to book my flight ticket.

ASSISTANT: Sure, I will help you. Please help me with your planned travelling dates.

USER: Thank you. I want to depart on Feb 5th and return back on Feb 7th.

ASSISTANT: Please help me with your name.

USER: My name is Anthony Rodriguez.

ASSISTANT: Do you need a break in your journey?

USER: Yes, I prefer for a single connection flight.

ASSISTANT: Do you have any other preferences in your journey?

USER: No.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Anthony Rodriguez, I am really sorry to inform you that there are no flights available for your journey.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us. Have a great time.