You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,. How can I help you?

USER: I need to book a flight.

ASSISTANT: Sure, Please help me with your journey details?

USER: OK, My source : TX-DFW and my destination : NY-JFK.

ASSISTANT: May I know your journey dates and your name?

USER: Yes, My name is Thomas Miller and my journey dates are from Sept/12 and to Sept/14.

ASSISTANT: Do you have any other specifications?

USER: I prefer my price limit to be 5000 and there is no connections limit for me.

ASSISTANT: OK, Please wait I will revert back to you in a while.

USER: OK.

ASSISTANT: Thank you for waiting. Sorry, They were no flights available as per your requirement.

USER: Thank you for your information.

ASSISTANT: Thank you for contacting us.