You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Christopher Martin. I am looking for a flight from IAD to CLT, can you help me out please?

ASSISTANT: Sure, can you please help me with your travel dates?

USER: My trip dates are from 08/11 to 08/13.

ASSISTANT: Here, I found a flight for you with 1 connection and fare is 900. Shall I proceed?

USER: I need a flight with 200 price limit.

ASSISTANT: Sorry, no flights are available on your route within your budget.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Welcome, have a nice day.