You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have to attend music event at Washington, can you please help me to book a flight ticket from PHL to IAD?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: My travelling dates are Oct 29 and Oct 31.

ASSISTANT: Ok, please mention your name.

USER: My name is Stephanie Miller.

ASSISTANT: Ok, do you have any connection limit?

USER: I need a single connection flight.

ASSISTANT: Ok, do you have any other specifications?

USER: No.

ASSISTANT: Sorry, no flights are available on your route.

USER: No problem, thank you for your information.

ASSISTANT: Welcome, have a safe flight.