You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Karen Thomas.

ASSISTANT: How may I assist you?

USER: I have to attend my grandfather's memorial service in Las Vegas, NV -LAS.

ASSISTANT: Sure, may I know your journey days to book the ticket?

USER: Ok, I wish to travel on 03/11 and 03/13.

ASSISTANT: Kindly provide your source point.

USER: My source point is Charlotte, NC - CLT.

ASSISTANT: Thank you for the information, we found a flight with price 200 and AA as airline.

USER: Ok, please proceed to book.

ASSISTANT: Your ticket has been booked with flight number 1003.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.