You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Stephanie Hill. Can you please help me with booking a flight ticket from LGA to AUS?

ASSISTANT: Sure, can I know your travelling dates?

USER: Travelling dates are 03/29 and 03/31.

ASSISTANT: Do you have any class preference?

USER: I prefer economy class.

ASSISTANT: Can I know your depart and return time?

USER: I would like to depart at afternoon.

ASSISTANT: Wait a minute.

USER: Ok.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.