You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Green.

ASSISTANT: How may I assist you today?

USER: I want to book a ticket from AUS to AUS. Can you help me?

ASSISTANT: Sure, please provide me your travel dates?

USER: My travel dates are from 05/28 to 05/30. I need a direct flight.

ASSISTANT: Sorry, I cannot find any direct flight.

USER: It's fine.

ASSISTANT: Thanks for contacting us.

USER: Thank you for your help.