You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please share your journey dates?

USER: My journey dates are 02/11 to 02/13.

ASSISTANT: Do you have any specifications?

USER: I need a halt.

ASSISTANT: Sorry, there were no flights with your given details.

USER: No problem, thank you for your information.

ASSISTANT: May I know your name?

USER: My name is Charles Thompson.

ASSISTANT: Thank you.