You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Donna Harris here. I want to meet my parents to celebrate my birthday, could you book my ticket from LAS to LGA.

ASSISTANT: Sure, can you confirm your planned travel dates?

USER: My itinerary dates are May 14 and May 16.

ASSISTANT: Thank you, do you have any another specifications on this trip?

USER: I need a connecting flight.

ASSISTANT: Sorry to inform you that, no flights are available on your requirement dates.

USER: No problem, thank you.

ASSISTANT: Welcome, thank you for reaching us.