You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Stephanie Davis. I planning to go for Comic show, can you please book a ticket to San Francisco, SFO?

ASSISTANT: Sure, can you please share your source code?

USER: Source code is Austin, AUS.

ASSISTANT: Ok, kindly mention  your travelling dates?

USER: Journey starts from 02/20 to 02/22.

ASSISTANT: Do you have any other restrictions to be met?

USER: I need direct flight.

ASSISTANT: Ok, please hold a moment, let me search a flight for you.

USER: Sure.

ASSISTANT: Thanks for your time, unfortunately we did not find any flight on that route.

USER: No problem. Thank you.

ASSISTANT: Thank you for opting us.