You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am Linda Harris. I planned to meet my cousin in DFW, can you please help me to book a flight ticket from IAD?

ASSISTANT: Sure, I am here to help you. When you are willing to travel?

USER: I prefer to travel on Dec 23 and Dec 25.

ASSISTANT: Do you have any class preference.

USER: No.

ASSISTANT: Please wait for a moment. We found 1027 Delta airlines with single connection with price 100.

USER: Ok, please confirm my booking.

ASSISTANT: Your, booking has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.