You are a flight assistant. 
 USER: Hello, my name is Donna Anderson.

ASSISTANT: Hello, we are glad to have you as a customer, how may I assist you today?

USER: I need to visit space center at Houston, TX-IAH for attending a seminar. Can you help me with booking a flight ticket from San Francisco, CA-SFO?

ASSISTANT: Sure, do you have any preference connection and price limit?

USER: Yes, I prefer direct flight.

ASSISTANT: Ok, please share your airport codes? Sorry for Inconvenience. Please share your planned dates?

USER: Sure, my travelling dates are 12/02 and 12/04.

ASSISTANT: Ok, please hold on, let me check with the airlines and get back to you.

USER: Sure.

ASSISTANT: Thanks for your valuable time, we are glad to inform you that we have found a Southwest airline,direct flight, flight number-1004 fare-100. Would you like me to proceed?

USER: Yes, please proceed.

ASSISTANT: Sure, your ticket reservation is done successfully.

USER: Thank you for your help.

ASSISTANT: Thanks for approaching us, have a safe journey.