You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you at this moment?

USER: I want to book a ticket from HOU to PHL. Could you book a ticket?

ASSISTANT: When are you planning to make your journey?

USER: Depart is by Mar, 17 and return date is Mar, 19.

ASSISTANT: Do you like to go with a connecting or direct flight?

USER: I would be comfortable with single stop over.

ASSISTANT: Ok, please let me know if you need anything else in the mean while I will check.

USER: I prefer business class.

ASSISTANT: May I know your name please?

USER: My name is Susan King.

ASSISTANT: No flights found as per your preferences at the moment.

USER: Thank you.

ASSISTANT: Thank you for choosing us.