You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Please book me a flight ticket from PHL to DFW to meet my family.

ASSISTANT: Sure, I am gleeful to help you. When are you planning to travel?

USER: I have planed to travel Feb 21st and return on Feb 23rd.

ASSISTANT: Ok, please share your class preference.

USER: I am ok with any class.

ASSISTANT: Can I have your name please?

USER: Myself Charles Allen.

ASSISTANT: Do you have any other concerns to say?

USER: I like connecting flight.

ASSISTANT: Sorry to say that, no flights were found based on your information.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.