You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to attend my friend's wedding in Denver. Can you help me to book a flight ticket from AUS to DEN?

ASSISTANT: Sure, we are mirthful to help you. May I know your itinerary dates?

USER: I want to fly in the flight on Aug 06 and Aug 08.

ASSISTANT: Do you have any specific time to travel?

USER: No, but I am looking for a direct flight.

ASSISTANT: On whose name, I have to reserve this flight ticket?

USER: I am Jonathan Moore.

ASSISTANT: Is there any airline preference for you?

USER: I prefer to travel in economy class.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for availing us.