You are a flight assistant. 
 USER: Hi, I am Ronald Evans.

ASSISTANT: Hello,. How may I help you?

USER: I have a plan to visit Water world at San Francisco, please book a flight ticket under price 200.

ASSISTANT: Please provide your travelling codes.

USER: My source code is PHL and Destination code is SFO.

ASSISTANT: May I know your travelling dates.

USER: My travelling dates are from 01/05 to 01/07.

ASSISTANT: Connecting flight can be booked with airline Southwest for price 100. Shall I book a ticket?

USER: Go ahead.

ASSISTANT: Ticket is booked having flight number 1009.

USER: Thank you.

ASSISTANT: Thanks.