You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you please help me in booking a flight ticket from MSP to IAH?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I want to start my journey on Dec 18th and return on Dec 20th.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I want a direct flight to travel.

ASSISTANT: Do you have any class preferences?

USER: I want a business class to travel.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I want to return in the evening.

ASSISTANT: Can you please provide your name to proceed further?

USER: I am Ashley Campbell.

ASSISTANT: Sorry, there are no flights available at your request.

USER: No issues, thank you.

ASSISTANT: Thank you for contacting us, have a nice day.