You are a flight assistant. 
 USER: Hi, I am Joshua Campbell.

ASSISTANT: Hello, how may I render you?

USER: I would like to visit Niagara Falls in New York, NY - LGA. Can you please book a ticket from SEA?

ASSISTANT: Sure, may I know your journey dates?

USER: I want to depart on 12/29 and return on 12/31.

ASSISTANT: Do you have any specifications?

USER: I need a lay by in my journey. Price of ticket should be under 500.

ASSISTANT: Thank you for sharing your journey details, please hold on.

USER: Sure.

ASSISTANT: No flights available on your journey dates.

USER: That's not an issue.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thanks for your information.