You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Please book a ticket to Washington, IAD to attend Fashion show competition.

ASSISTANT: Sure, I will help you. Please provide your source airport code.

USER: My source is Chicago, ORD.

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are Dec 24 and Dec 26.

ASSISTANT: Do you have any preferences?

USER: I want single connection.

ASSISTANT: May I know your name?

USER: Sure, I am Frank Johnson.

ASSISTANT: There is a connecting flight available with JetBlue airline, shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your booking is done with flight number 1018. Happy journey.

USER: Thank you.

ASSISTANT: You are welcome, have a nice day.