You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Betty Lewis. I am planning to visit my sister's home at Washington. Can you please book a ticket from LAX to IAD?

ASSISTANT: Sure, may I know your trip dates please?

USER: I am planning to travel on 01/04 and return back on 01/06.

ASSISTANT: Ok, please allow me a moment.

USER: Sure.

ASSISTANT: The Frontier airline with flight number 1019 is available, shall I proceed booking?

USER: May I know the price?

ASSISTANT: The price is 100.

USER: Yes, you can proceed the booking.

ASSISTANT: Ok, your reservation is done.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.