You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to book a ticket  from IAD to PHL. Can you please help me out?

ASSISTANT: Sure, may I know your travel dates?

USER: I am planning to travel on Feb 28 and return back on Mar 01.

ASSISTANT: Do you have any specifications?

USER: I am looking for a connecting flight.

ASSISTANT: Please share me your name.

USER: My name is Raymond Smith.

ASSISTANT: Sorry, there is no flight at this moment.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you.