You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Mark Hernandez.

ASSISTANT: In which way I can help you at this moment?

USER: I would like to reserve a plane ticket from 02/16 to 02/18.

ASSISTANT: Sure, I will help you in booking flight ticket. Could you please mention your preferable airport code names?

USER: Sure, my source and destination locations are IAH to SFO.

ASSISTANT: Ok, please hold on a moment, I will check flight availability in this route.

USER: Ok.

ASSISTANT: I have found a flight in this route, airline is UA and flight number is 1006. Is it ok for you?

USER: Yes, please book my ticket.

ASSISTANT: Your flight ticket is booked successfully.

USER: Thank you.

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