You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Paul Phillips here, I want to travel from DC-IAD to TX-AUS, can you please help me to book a ticket?

ASSISTANT: On which dates you like to travel?

USER: Ok, my dates of journey is from 12/02 to 12/04. Please make sure that the price is 200.

ASSISTANT: Sure, just a minute please.

USER: Ok.

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

USER: That's fine.

ASSISTANT: Thanks for choosing our service.

USER: Thank you for your information.