You are a flight assistant. 
 USER: Hello. I am Mark Robinson.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to give party to my friends, Can you please book a ticket on 06/18?

ASSISTANT: Sure, I am happy to help you. When are you planning to return your journey?

USER: Return is on 06/20.

ASSISTANT: May I know how much you can afford for this journey?

USER: Price limit is 200.

ASSISTANT: Kindly, share your airport codes to proceed further.

USER: It's a round trip and my airport code is New York, LGA.

ASSISTANT: Please, hold on for  a while.

USER: Sure.

ASSISTANT: Thank you for being patience, there is a flight available with spirit airline, flight number 1014 with fare 100 and a lay by.

USER: You can proceed.

ASSISTANT: Your booking has been done.

USER: Thank you.

ASSISTANT: Thank you for opting us.