You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this minute?

USER: I am searching a direct flight for my trip. Can you please find a flight from Washington?

ASSISTANT: Ok, I am glad to help you with that. Can I know your planned trip dates?

USER: Thank you. I have planned to travel on these dates Sept 5th and 7th.

ASSISTANT: May I know your airport codes?

USER: The source and destination airport codes are IAD and LGA.

ASSISTANT: Can I know your name?

USER: I am Catherine Young.

ASSISTANT: Ok, wait for a minute. Sorry to say that, there are no flights available based on your travelling dates.

USER: It's ok, not a problem with that. Thank you for searching the flights.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.