You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I am Andrew Hall. I planned to attend for a meeting in EWR, can you please help me to book a flight ticket from IAD?

ASSISTANT: Sure Andrew Hall, I am happy to help you with that. Can I have your travel dates please?

USER: I prefer to travel on Oct 14 and Oct 16.

ASSISTANT: Ok, please wait a moment to check flight availability.

USER: Sure.

ASSISTANT: I have found a flight in Southwest airlines which is having connection 1 and ticket fare is 700. Shall I proceed with booking?

USER: Can you please check for a flight within price of 500?

ASSISTANT: Sorry Andrew Hall, no flight is available to you with in your budget.

USER: Ok, no problem. Thank you for your time.

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