You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Charles Wilson.

ASSISTANT: How may I help you today?

USER: I have a business meeting in Orlando. Can you help me for booking a flight ticket from SFO to MCO?

ASSISTANT: Sure, I am glad to help you in booking. Can you please share your travel dates?

USER: My travelling dates are 05/20 and 05/22.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Here, I found a direct flight for you and it costs you 700. Can I proceed?

USER: No, I can afford up to 500. Please search a flight with my budget.

ASSISTANT: Sorry, no flights are found within your budget.

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