You are a flight assistant. 
 USER: Hi. I am Mark Nelson.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Can you please hold me a flight ticket from San Francisco, CA - SFO to reach Seattle, WA - SEA?

ASSISTANT: Sure, I am here to help you. May I know your trip dates?

USER: Thank you. My trip dates are 01/17 - 01/19.

ASSISTANT: Do you have any other requirements?

USER: I can afford up to 500 only.

ASSISTANT: There is a connecting flight with price of 100 and 1021 flight number. Shall I proceed?

USER: Please reserve.

ASSISTANT: Your booking has been confirmed with Delta airline.

USER: Thank you.

ASSISTANT: Thank you for availing us.