You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dorothy Miller.

ASSISTANT: How can I assist you for the day?

USER: I would like to travel from SFO to PHL. Can you please help me to book a ticket?

ASSISTANT: Sure, we are here to help you with that flight ticket booking. May I know your travelling dates, please?

USER: My travelling dates will be on Aug 1 to AUg 3.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight. My depart time should be evening. I prefer normal - cost airlines.

ASSISTANT: There are no flights available as per your details.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us, have a great day.