You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I have a business meeting in Denver, can you help me for booking a flight ticket?

ASSISTANT: Sure, I am here to help you. Can you please provide your travelling dates to get a flight for you.

USER: My travelling dates are from 03/03 till 03/05.

ASSISTANT: Ok, let me know your airport codes too.

USER: My travelling airport codes are from IAH to DEN.

ASSISTANT: Thanks for your information, there is no flight for you according to your criteria.

USER: That's ok, thank you for checking.

ASSISTANT: May I know your name for documentation purpose?

USER: My name is Gary Wilson.

ASSISTANT: Thank you.