You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you at this moment?

USER: I am looking for a direct flight for my business trip to Atlanta. Can you book the flight ticket for me?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: The trip dates are from Mar 31 to Apr 02.

ASSISTANT: May I know your airport codes of journey please?

USER: The airport codes are from IAH to ATL.

ASSISTANT: Do you have any class preference?

USER: No. I prefer a morning time depart.

ASSISTANT: May I know your good name please?

USER: I am Amanda Clark.

ASSISTANT: Amanda Clark, there are no flight services are available on this route with your preferences.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for contacting us.