You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I would like to visit Washington, please help me in booking a ticket from PHL to IAD.

ASSISTANT: Sure, we are mirthful to help you. May I know on which dates you are planning to start and return?

USER: My planned travel dates are on Dec 29 and Dec 31.

ASSISTANT: Do you prefer any way station in between journey?

USER: I need a connecting flight.

ASSISTANT: Is there any other specifications regarding your journey?

USER: I would like to return in the evening.

ASSISTANT: May I know your good name please?

USER: My name is Gregory White.

ASSISTANT: Please be on hold for sometime to check the suitable flight for your journey.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, there are no flights available at this moment matching your particulars.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thanks for approaching us, wish you a great day.