You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to book a ticket from LGA to IAD. Can you please help me out?

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

USER: I am planning to travel on Apr 23 and return back on Apr 25.

ASSISTANT: Can you please share your name?

USER: My name is Kevin Wright.

ASSISTANT: Is there any connection preference?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: My return time should be evening.

ASSISTANT: Kevin Wright, there are no flights available in your route with your preferences.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for choosing us.