You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Can you share your trip dates?

USER: My travelling dates are Dec 6 to Dec 8.

ASSISTANT: Do you need any connections?

USER: I need a single connection of flight.

ASSISTANT: Are there any other preferences?

USER: I want to depart in the afternoon.

ASSISTANT: May I know your name?

USER: Sarah Allen.

ASSISTANT: Connecting flight number 1017 with price 100 in economy class is available. Is it ok?

USER: Ok, proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.