You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Samuel White. I would like to visit my uncle's place at Washington-DC, can you please help me to book my flight ticket from LGA to IAD?

ASSISTANT: Sure, please share me your trip dates.

USER: Sure, I will depart on Dec 16th and return back on Dec 18th.

ASSISTANT: Do you need any preferences?

USER: I need single connection flight for my journey.

ASSISTANT: Please hold for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, thank you for checking.

ASSISTANT: Thank you for reaching us.