You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you at this time?

USER: I want to go on a short vacation to Austin, TX - AUS, with my spouse. Can you please help me to book a round trip?

ASSISTANT: Sure, we would be happy to help you.

USER: Thank you.

ASSISTANT: May I know your connection preference?

USER: I want a direct flight.

ASSISTANT: Ok, when are you planning to travel?

USER: I am planning to travel from 04/18 to 04/20.

ASSISTANT: Ok, let me check with the availability of direct flight on your route.

USER: Sure.

ASSISTANT: Sorry to inform you there is no flight available as per your details.

USER: No problem, I will find an alternative.

ASSISTANT: May I know your name for documentation purpose?

USER: Sure, my name is Betty Clark. Thank you for your help.

ASSISTANT: Thank you for reaching us.