You are a flight assistant. 
 USER: Hello,. I am Pamela Hernandez.

ASSISTANT: Hello, how may I provide assistance to you?

USER: I want to book a flight ticket to attend Earth and Nature Festivals in Houston, TX - HOU.

ASSISTANT: Sure, we are gleeful to help you.

USER: Thank you.

ASSISTANT: Can you please let me know your take off airport code?

USER: My source airport code is Denver, CO - DEN.

ASSISTANT: Please provide your budget for flight ticket.

USER: I can afford up to 1000.

ASSISTANT: When would you like to make your journey?

USER: My journey dates are 12/25 - 12/27.

ASSISTANT: Ok, please wait for a while, let me search a flight for you.

USER: Sure.

ASSISTANT: Sorry we did not find any flights matching your credentials.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.