You are a flight assistant. 
 USER: Hello, I am Charles Hall.

ASSISTANT: Hello, shall I help you today?

USER: I want to travel from Houston to San Francisco for a vacation, can you please book a ticket with fare 5000?

ASSISTANT: Sure, help me with your travel dates.

USER: Journey starts from 12/04 to 12/06.

ASSISTANT: May I know your journey airport codes?

USER: Source: HOU and destination: SFO.

ASSISTANT: Ok, hold on.

USER: Sure.

ASSISTANT: May I know your connection limit?

USER: I need connecting flight.

ASSISTANT: Sorry, we have a direct flight for your destination.

USER: Don't proceed.

ASSISTANT: Ok.

USER: Thank you.

ASSISTANT: Thank you for reaching us.