You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

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

ASSISTANT: May I know your travelling dates?

USER: I prefer to travel on Mar 26 and Mar 28.

ASSISTANT: Please let me know your name?

USER: I am Charles Carter.

ASSISTANT: Do you need connecting flight?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Do you have any other preference?

USER: No.

ASSISTANT: Sorry, no flights available on your route.

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

ASSISTANT: Thank you for reaching us.