You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

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

ASSISTANT: Sure, could I have your trip dates, please?

USER: I want to fly on Mar 18 and return on Mar 20.

ASSISTANT: May I know your good name?

USER: Myself Deborah Perez.

ASSISTANT: Do you prefer a connecting or direct flight?

USER: I need a single connection.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for choosing us.