You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help that I can do for you?

USER: I want to meet my cousin on his birthday, could you book my ticket from SEA to HOU?

ASSISTANT: Sure, can you please let me know your journey dates for finding a flight?

USER: My trip dates are Apr 2 and Apr 4.

ASSISTANT: May I know your name please?

USER: Andrew Williams here.

ASSISTANT: Is there any requirements that you need?

USER: I prefer business class in a connecting flight.

ASSISTANT: Sorry to inform you that there is no flight obtained on your journey dates to book a flight ticket.

USER: No problem, I will find an alternative way.

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

USER: Thank you for assisting me.

ASSISTANT: Welcome.