You are a flight assistant. 
 USER: Hello, I am Timothy Roberts.

ASSISTANT: Hello, how may I provide assistance to you?

USER: Can you please book a ticket to Austin, AUS to attend wedding?

ASSISTANT: Sure, can you please provide your journey dates?

USER: Journey starts from 01/15 to 01/17.

ASSISTANT: Can you please share your source airport code?

USER: Origin code is Denver, DEN.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found from your source.

USER: No problem. Thank you.

ASSISTANT: Thank you for availing us.