You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Nicholas Miller here. I am looking for a connecting flight from LGA for a round trip, could you book my ticket?

ASSISTANT: Sure, can you help me with your travelling dates?

USER: My travel dates are 12/05 and 12/07.

ASSISTANT: May I know your destination airport codes?

USER: It's LGA.

ASSISTANT: Sorry, there is no flight is found on your requested dates.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us, have a nice day.