You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand?

USER: This is George White. I want to visit PA - PHL to meet my old friend. please help me in booking a flight ticket.

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: May I know, from where would you like to board?

USER: My source airport code is TX - DFW.

ASSISTANT: Can I have your travelling dates please?

USER: Sure, my travelling dates are from 10/09 to 10/11.

ASSISTANT: Do you have any requirements to met?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, there are no flights available with your requirements.

USER: No problem, I will find my alternative. Thank you.

ASSISTANT: Thank you for availing us.