You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I useful to you?

USER: I have a wedding party to attend in IAD, can you please help me to book a flight from LGA?

ASSISTANT: Sure, we are willing to help you.

USER: Thank you.

ASSISTANT: Can I know your connection preference?

USER: I prefer to fly with a connecting flight.

ASSISTANT: When are you planning to travel?

USER: I am planning to start on Aug 4th and return back on Aug 6th.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will be right here.

ASSISTANT: Thank you for waiting, sorry to inform you that there is no flight available on your route.

USER: No problem, thank you for checking it.

ASSISTANT: Thank you for choosing us.