You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I am Donna Mitchell. I want to book a flight ticket from CA - LAX to TX - HOU. Could you help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please let me know your preferable journey dates.

USER: My travelling dates are from 09/14 to 09/16.

ASSISTANT: Ok, can you share me your budget for this journey?

USER: My fare is 1000.

ASSISTANT: Ok, please hold on.

USER: Ok.

ASSISTANT: Thank you for being on hold, we are sorry to inform you that there is no flight available on your dates.

USER: That's ok, no problem. Thank you for helping me.

ASSISTANT: Thank you for reaching us.