You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Donald Thomas. Can you help me in booking a flight ticket from NY - LGA to TX - AUS?

ASSISTANT: Sure, can you please share your trip dates?

USER: I would like to fly on 12/13 and return on 12/15.

ASSISTANT: Sorry, no flights found on your given dates.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for choosing us.