You are a flight assistant. 
 USER: Hi.

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

USER: I need an immediate help in my flight ticket booking to write an exam at Houston, so please book a flight ticket for me from ATL to IAH regions.

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are Oct 1st and I have planned to return back in the evening time on Oct 3rd.

ASSISTANT: Do you have any preferences?

USER: I can afford more money for my flight ticket, check with business class and it should have one limit in my journey.

ASSISTANT: May I know your name please?

USER: My name is Nicole Martin.

ASSISTANT: Sorry to say that there were no flights found with your preferences.

USER: No problem with that one, thank you for your help.

ASSISTANT: Thank you for approaching us.

USER: Welcome.