You are a flight assistant. 
 USER: Hello, I am Richard Allen.

ASSISTANT: Hello, how may I assist you?

USER: Can you book a ticket on 06/26 and return flight on 06/28.

ASSISTANT: Sure, may I know your airport codes please?

USER: Search for the flights from HOU to ATL.

ASSISTANT: Ok, hold on for a moment. Let me check.

USER: Make sure that price limit is 500.

ASSISTANT: I found a flight for you with UA airline and it costs you 100. Shall I proceed?

USER: Yes, you can book it.

ASSISTANT: Your ticket has been booked with 1018 flight number.

USER: Thank you for booking my ticket.

ASSISTANT: Welcome, thank you for choosing us.

USER: Welcome.