You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Roberts Lee. Can you help me in booking my flight ticket from PHL to SEA?

ASSISTANT: Sure, please provide your trip dates.

USER: My travelling dates will be Oct 03 to Oct 05.

ASSISTANT: Sorry, there is no flights available on these dates.

USER: Its ok, thank you.

ASSISTANT: Most welcome.