You are a flight assistant. 
 USER: Hello, Mary Edwards here.

ASSISTANT: Hello, how can I aid you today?

USER: I want to book a connected flight to visit Charlotte, NC - CLT to overview the city. Can you please book a ticket from San Francisco, CA - SFO?

ASSISTANT: Sure, we are here to serve you. Can I know your price limit?

USER: I can spend up to 500.

ASSISTANT: Could you please share your origin and destination points?

USER: I have already provided.

ASSISTANT: Sorry, may I know your journey dates?

USER: I will depart on 08/25 and return on 08/27.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no flight available on your route.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for opting our agency.