You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I planned to meet my friend in ATL, can you please help me to book a flight ticket from PHL?

ASSISTANT: Sure, I will help you. Can I have your planned travel dates please?

USER: I prefer to travel on Aug 18 and Aug 20.

ASSISTANT: May I know your name please?

USER: I am Betty Williams.

ASSISTANT: Do you need a connecting flight?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I would like to travel in normal cost airline.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Betty Williams, no flights has been found on your preferences.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.