You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to visit National Zoological Park at Washington with my friend, please book a ticket from ATL to DCA.

ASSISTANT: Sure, please help me by giving your trip dates.

USER: Sure, my trip dates are 03/23 and 03/25.

ASSISTANT: Ok, let me know your name.

USER: My name is Deborah Edwards.

ASSISTANT: According to your preferences, there is no flight for you.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Welcome Deborah Edwards.