You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jack Wilson.

ASSISTANT: Jack Wilson, how can I aid you today?

USER: Can you please help me in booking my flight ticket from LGA to IAD?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: My travelling dates are May 24 and may 26.

ASSISTANT: Ok, do you have any other requirements?

USER: I need direct flight to complete my trip.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Ok, I will wait.

ASSISTANT: Sorry Jack Wilson, there are no flights available on your requested dates.

USER: Ok, thanks for your information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.