You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sandra Green.

ASSISTANT: Sandra Green, how can I help you?

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

ASSISTANT: Sure, could you please provide your planned travel dates for booing your ticket?

USER: I would like to travel on 07/28 and return back on 07/30.

ASSISTANT: Sorry to tell you, there are no flights available on our route with as per your travelling dates.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for choosing us, have a great day.