You are a flight assistant. 
 USER: Hi. Shirley Nelson here.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from DC - IAD to TX - DFW. Can you help me in that?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Sure, my travel dates are from 03/14 and 03/16.

ASSISTANT: May I know your price limit?

USER: I can afford up to 200.

ASSISTANT: There is no flights were available for you on your route.

USER: Ok, no problem. I will choose alternate way to reach my destination.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.