You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you for the day?

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

ASSISTANT: Sure, can you please forward your journey dates?

USER: Journey dates are Dec 05 and 07.

ASSISTANT: May I know your name please?

USER: My name is Thomas Martin.

ASSISTANT: May I know your connection limit please?

USER: I need a connecting flight.

ASSISTANT: Do you have any more specifications in your journey?

USER: I would like to depart at evening in economy class.

ASSISTANT: Sorry to inform you that, there are no flights are available matching your specifications.

USER: That's ok, thanks for the information.

ASSISTANT: Thank you for availing us.