You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Katherine Miller.

ASSISTANT: How may I assist you now?

USER: I am planning a family trip to see New York, can you please book a flight ticket from IAD to LGA?

ASSISTANT: Sure, I am oblige to help you with that. Can you please provide your preferable dates of travelling?

USER: I will start on Dec 31st and return on Jan 2nd.

ASSISTANT: Do you have any class preference?

USER: No, I don't have.

ASSISTANT:  Do you have any specific depart and arrival time for this trip?

USER: I want to depart in the morning but I am fine to return any time.

ASSISTANT: Do you have any connection limit?

USER: Please find a flight with max one connection.

ASSISTANT: Please hold on a moment to check the flights.

USER: Sure.

ASSISTANT: We regret to tell you that, there are no flights running on your route with your required preferences.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us, have a great day.