You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Deborah Turner here.

ASSISTANT: How can I help you today?

USER: I am looking for a flight from LGA to IAD, hope you are helping me with booking.

ASSISTANT: Sure, I am happy to help you. May I know your trip dates?

USER: Ok, my preferable dates are from Feb 21 to 23.

ASSISTANT: Do you have any stopover in between journey?

USER: Yes I need a connecting flight and I want to departure in the evening time.

ASSISTANT: Is there any other specifications for you?

USER: No.

ASSISTANT: Thanks for providing details, no flights are available on your journey routes.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for reaching us.