You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I have some urgent work in my hometown. So, can you book my tickets from my current location New York LGA ?

ASSISTANT: Can you provide me the details of the flight?

USER: I like to take off from New York on 06/13 and come back to New York on 06/15.

ASSISTANT: Can I know the airport codes?

USER: New York airport code is NY - LGA. Please book my tickets with my name, Patrick Thompson.

ASSISTANT: Hold on for a moment.

USER: OK.

ASSISTANT: I'm sorry Patrick, there are no flights matching your requirements.

USER: OK. Thank you for your time.

ASSISTANT: Thank you, have a good day.