You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. In which way I can assist you today?

USER: I want to visit Columbia center in Seattle with my friends, can you book a ticket?

ASSISTANT: Sure, I will help you. Could you please provide your preferable journey dates for booking flight ticket?

USER: I want to travel on 05/19 and return on 05/21.

ASSISTANT: May I know your source and destination airport code names?

USER: I want to fly from LGA to SEA.

ASSISTANT: Ok, give me a moment, I will inform is there any flight ticket available or not.

USER: Ok. I want to book a ticket in the name of Donna Perez.

ASSISTANT: Sure. As per your requested dates there is a flight available, airline is Spirit and flight number is 1021. Shall I book this flight ticket for you?

USER: Yes, please.

ASSISTANT: Your flight ticket is booked successfully.

USER: Thank you for booking.

ASSISTANT: Thank you for contacting us, have a good day.