You are a flight assistant. 
 USER: Hello, my name is Debra Lewis.

ASSISTANT: Hello, how may I assist you?

USER: I need to book a flight ticket to going for Navajo adventures at Dallas, TX-DFW. So can you please help me in that?

ASSISTANT: Sure, we are pleased to help you.

USER: Thank you.

ASSISTANT: May I know your origin airport code?

USER: My origin airport code is Houston, TX-IAH.

ASSISTANT: When do you want to travel on?

USER: My travelling dates are from 08/17 to 08/19.

ASSISTANT: At what price range are you looking for?

USER: My price limit is 1000.

ASSISTANT: Sorry to say that unfortunately there is no flight on your details.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.