You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anna Barker.

ASSISTANT: How can I assist you?

USER: I am planning to book a ticket to attend meeting at LAS. Can you please help me out to book a ticket from DFW?

ASSISTANT: Sure, I can help you with that. May I know your preferable travel dates please?

USER: I am planning to travel on 01/08 and return back on 01/10.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.