You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Donald Young. I would like to meet my brother on his birthday, can you please help me to book my flight ticket from LGA to AUS?

ASSISTANT: Sure, help me with the trip dates?

USER: Sure, I want to depart in the evening on Dec 27th and I want to return back on Dec 29th.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Let me know if you have any requirements?

USER: Please check for the direct flight.

ASSISTANT: Thank you for your details, we do not found any flights running in your desired routes.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for reaching us.