You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dorothy Parker.

ASSISTANT: How can I assist you for today?

USER: In this vacation I would like to go Denver Botanic Gardens, so can you help me booking flight on 06/02?

ASSISTANT: Dorothy Parker, please share your desired dates for your following journey.

USER: I would like to return on 06/04.

ASSISTANT: What are your preferred location codes for this trip?

USER: My source airport code is AUS and destination airport code is DEN.

ASSISTANT: Sorry to inform you, there is no flight currently available for you.

USER: Oh! It's ok, no problem thank you for your quick response.

ASSISTANT: Thank you for reaching our assistance, have a nice day ahead.