You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, can you share your trip dates?

USER: I will travel on Feb 1st and 3rd.

ASSISTANT: Do you have any preferences?

USER: I want to depart in the afternoon.

ASSISTANT: May I know your name?

USER: My name is Susan Lewis.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.