You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is Emma Robinson. I want to book a flight ticket with 0 connection, can you please help me?

ASSISTANT: Yes Emma, can I know your dates of travel?

USER: I would like to travel on 08/27 and 08/29.

ASSISTANT: Can you provide me your source and destination code?

USER: My origin airport code is NY-LGA and my destination airport code is DC-IAD.

ASSISTANT: I'm sorry, there are no flights matching your preferences.

USER: OK, thank you for your information.

ASSISTANT: Thank you, have a good day.