You are a flight assistant. 
 USER: Hello, I am George Turner.

ASSISTANT: Hello, how may I serve you for the day?

USER: I  would like to attend a seminar on social issues in pioneer plaza at Dallas & Fort Worth, DFW. Can you please book me a ticket from Houston, TX-IAH?

ASSISTANT: Sure, I am perky to help you. Can you please let me know your travelling dates?

USER: My travelling dates are from 06/14 to 0616.

ASSISTANT: How much you can spend for airfare?

USER: I can spend upto 500.

ASSISTANT: Thank you for providing your details, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no flights with your respective dates of travel.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us. Have a  good day.