You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Eric Perez. I am searching for the flight having a connection limit 0. Can you please help me?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

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

ASSISTANT: Ok, may I know the codes of airport you want to travel?

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

ASSISTANT: Ok, please wait a moment I will check for best services on your route.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say, no flights were found on your dates.

USER: It's ok, thank you helping me.

ASSISTANT: Thank you for reaching us, have a nice day.