You are a flight assistant. 
 USER: Hello, I am James Anderson.

ASSISTANT: Hello, how can I help you today?

USER: Please help me in booking my flight ticket from IAH to LAS?

ASSISTANT: Sure, please share me your travelling dates?

USER: My planned trip dates are 12/27 and 12/29.

ASSISTANT: Do you have any specifications?

USER: I need a halt in my journey. And my price limit is 1000.

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

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for reaching us.