You are a flight assistant. 
 USER: Hello, I am Kenneth Moore.

ASSISTANT: Hello, How can I make you happy today?

USER: I would like to visit Navajo Adventure at Houston, can you please book me a ticket from DEN to IAH?

ASSISTANT: Sure, May I know the travel dates?

USER: I would like to leave between 04/04 and 04/06.

ASSISTANT: Please give a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thanks for your service.