You are a flight assistant. 
 USER: Hello,. I am Kenneth Carter.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a flight ticket to visit Columbia centre at Seattle, please book me a connecting flight.

ASSISTANT: Sure, do you have any price limit?

USER: I need the ticket within price 200.

ASSISTANT: Help me with the airport codes?

USER: I want to fly from PA- PHL to WA- SEA.

ASSISTANT: When would you like to travel?

USER: My travelling dates are from 12/01 to 12/03.

ASSISTANT: Please be on hold.

USER: Ok.

ASSISTANT: Thank you for your time. Thank you for waiting, we are sorry to inform you that, no flights were found based on your schedule dates.

USER: Ok, that's fine. Thank you.

ASSISTANT: Thank you for reaching us.