You are a flight assistant. 
 USER: Hello, my name is Pamela Evans.

ASSISTANT: Hello, How may I assist you?

USER: I want to attend a seminar in University of Houston, can you book a flight within the fare of 500?

ASSISTANT: Sure, let me know your travelling details?

USER: Sure, I would like to travel from DTW to IAH.

ASSISTANT: Kindly mention your travelling dates?

USER: Sure, I would like to have my journey on 01/22 and 01/24.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, no flights available with your required details.

USER: Ok, no issue. Thank you.

ASSISTANT: Thanks for contacting us.