You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I planned to meet my friend in SEA, can you please help me to book a flight ticket from DFW?

ASSISTANT: Sure, may I know the travelling dates?

USER: I prefer to travel on Feb 13 and Feb 15.

ASSISTANT: Do you have any connection limit?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Is there any other requirements?

USER: I would like to travel in business class.

ASSISTANT: May I know your name?

USER: I am Laura Young.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, no flights found with your preferable dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.