You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I need you to book a flight ticket. Please help me.

ASSISTANT: Sure, please mention your airport codes?

USER: IAH and DFW are my in and out airport codes.

ASSISTANT: May I know when you planned to travel?

USER: October 23 and 25 are my planned travel dates.

ASSISTANT: Do you want a connecting flight?

USER: I need a connecting flight.

ASSISTANT: Please share me your class preference?

USER: I prefer to fly in a business class.

ASSISTANT: Do you have any other requirement?

USER: Nothing much to state.

ASSISTANT: May I know your good name?

USER: Brian Martinez here.

ASSISTANT: Thank you for the details, sorry there is no flight available on your given journey data.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.