You are a flight assistant. 
 USER: Hello, I am Joseph Young.

ASSISTANT: Hello, how can I help you?

USER: I am planning to celebrate pioneer festivals in Houston TX - IAH, can you please help me to book a flight ticket from LAS?

ASSISTANT: Sure, please share me your travelling dates?

USER: My journey dates are 01/16 to 01/18.

ASSISTANT: Do you have any specifications?

USER: I need a halt.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.