You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I'm James Perez.

ASSISTANT: How may I help you?

USER: I am planning to go to Las Vegas to attend a function, can you please book a flight ticket to me from DTW to LAS?

ASSISTANT: Sure, on what dates your flying?

USER: Sure, my preferable journey dates are 10/13 to 10/15.

ASSISTANT: I am sorry no flights available on your dates.

USER: That's ok.

ASSISTANT: Do you have any other dates for booking.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us.