You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Nicole Lee.

ASSISTANT: How can I help you Lee?

USER: Can you help me to book a flight with 500 price limit?

ASSISTANT: Ok, please tell us your travelling dates.

USER: My trip dates are 01/18 and 01/20.

ASSISTANT: May I know your travel airport codes?

USER: My airport codes are SFO and AUS.

ASSISTANT: I found a direct flight for you, shall I book?

USER: Sorry, I need a connecting flight.

ASSISTANT: I am sorry no flight with 1 connection is available on your route.

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

ASSISTANT: You are most welcome.