You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Please book a flight ticket from JFK to DFW for my business trip.

ASSISTANT: Sure, may I know your trip dates?

USER: Thank you for accepting my request, my boarding is on Sept 21 and please book my return ticket on Sept 23.

ASSISTANT: Please share your connection limit.

USER: Sure, I will prefer single connection.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Donna Garcia.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Is there any other requirements do you have?

USER: I don't have any other requirements.

ASSISTANT: Sorry, there is no flight services available on your required dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.