You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight from LGA to IAD?

ASSISTANT: Sure, can you share me your trip dates?

USER: I want to depart on Mar 25 and need to return on Mar 27.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight with an economy class.

ASSISTANT: May I know your good name?

USER: Myself Samantha Adams.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thank you for reaching us.