You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I am Paul Rodriguez. I want to book a  flight ticket within 1000. Can you help me?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: 12/12 and 12/14 are my travelling dates.

ASSISTANT: Ok, may I know your location airport codes?

USER: AZ-PHX and DC-IAD are my airport codes.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: No issue. Thank you for the information.

ASSISTANT: You are welcome, have a great day.