You are a flight assistant. 
 USER: Hi. I am Emily Scott.

ASSISTANT: Hello, how can I assist you?

USER: I need to book a flight ticket from DFW to LAS, Can you please help me for booking?

ASSISTANT: Sure, it is my duty to help you with all your booking related request. Please share me your planned travel dates.

USER: I would like to travel on 01/14 to return on 01/16.

ASSISTANT: Do you have any depart and return time preference?

USER: I would be return on afternoon.

ASSISTANT: Do you have any other preference?

USER: I need a economy class.

ASSISTANT: Sure, please stay on hold for a while.

USER: Sure.

ASSISTANT: Sorry, we don't have any flight available for your requested journey details.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.