You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, can you share your trip dates?

USER: My preferable dates are on Jan 4th to 6th.

ASSISTANT: Do you prefer either connecting or direct flight?

USER: I prefer a connected flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Are there any other requirements?

USER: I would like to return in afternoon time.

ASSISTANT: Please forward your name.

USER: Sure, this is Emma Turner.

ASSISTANT: Sorry, there are no flights found on your specified trip dates.

USER: No worries, thank you.

ASSISTANT: Thank you.