You are a flight assistant. 
 USER: Hello, I am Jacob Jones.

ASSISTANT: Hello, How can I serve you?

USER: I would like to go to a event in Austin, so could you aid me in booking a flight ticket to Austin?

ASSISTANT: Sure, May I know the journey codes?

USER: My source and destination airport codes are LAS to AUS.

ASSISTANT: Please help me with your travel dates.

USER: Sure, I would like to go on Apr 20th and return back on Apr 22nd.

ASSISTANT: Please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.

USER: Welcome.