You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to reserve my ticket from DFW to LAS, can you please help me in booking?

ASSISTANT: Sure, on what dates are you planning to make your trip?

USER: Sure, my willing to travel dates are from Apr, 16 to Apr, 18.

ASSISTANT: How many connections do you need?

USER: Yes, I want to fly in a connecting flight.

ASSISTANT: Any other requirements to be met?

USER: No.

ASSISTANT: Please forward your name.

USER: Sure, my name is William Thomas.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for choosing us.