You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Mark King. I have a plan to meet my friend in San Francisco, can you help me for booking a flight ticket from ORD to SFO?

ASSISTANT: Sure, please share your trip dates too.

USER: My travelling dates are from 05/10 till 05/12.

ASSISTANT: Here, I found a flight for you with 1 connection and fare is 300. Shall I proceed?

USER: I can afford only 200 for ticket.

ASSISTANT: Sorry, no flights are available with in your budget.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.