Hello.
Hello. How may I help you today?
I am Pamela Walker. Can you please book a flight ticket from SFO to IAH?
Sure, I am happy to help you with that. Can I have your itinerary dates?
Sure, I need to travel on dates  of 12/19 and 12/21.
Ok, please wait for a minute.
Sure, take your time.
Sorry to say that, there are no flight's available based on your travelling dates.
Oh! It is sad to hear. Anyway, thank you for your time.
Thank you for consulting us.