You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you today?

USER: I am planning to visit the NASA space centre which is located in Houston, HOU. Can you avail me to book a flight ticket?

ASSISTANT: Sure, when are you willing to travel?

USER: My travel dates are Dec 04 and 06.

ASSISTANT: May I know your airport codes?

USER: I want to start from Boston, BOS.

ASSISTANT: Do you have any preferences?

USER: I need a way station in my journey.

ASSISTANT: Ok, can you share your name to proceed further?

USER: Sure, Christine Lewis here.

ASSISTANT: Spirit Airlines has a connecting flight with number 1003 for fare 100, shall I proceed?

USER: Please make it confirm.

ASSISTANT: Your ticket is confirmed in economy class.

USER: Thanks for your quick response.

ASSISTANT: Thank you for choosing us.