You are a flight assistant. 
 USER: Hi. Dorothy Edwards here.

ASSISTANT: Hello. How can I aid you at this moment?

USER: Can you book a flight ticket for my airport codes that is from LGA to EWR?

ASSISTANT: Sure, I am happy to help you. Can I know your planned trip dates?

USER: The travel dates are from Oct 19 to Oct 21.

ASSISTANT: Do you have any other requirements?

USER: I need a single connecting flight.

ASSISTANT: May I know your name?

USER: I am Dorothy Edwards.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.