You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me to book a flight ticket from PHL to IAD?

ASSISTANT: Sure, is there any connection limit?

USER: I need a direct flight.

ASSISTANT: Ok, may I know your travel dates?

USER: My travelling dates are Oct 5 to Oct 7.

ASSISTANT: Can I have your name for further process?

USER: Frank Martinez here.

ASSISTANT: Ok, please hold on.

USER: Sure.

ASSISTANT: Thanks for being on hold, there are no flights available with your given details.

USER: It's ok, thank you.

ASSISTANT: Thanks for reaching us.