Hello.
Hello, How can I serve you?
My name is Alexander Lee. Can you check whether there are any flights available on dates 08/19 and 08/21?
Ok, Can you please provide me your airport abbreviates?
Sure, I would like to travel from SFO to IAD.
 Ok, give me a moment to check with the flight availability.
Ok.
Thanks for your time. We apologize, but we do not have any flights with your preferred dates.
Ok, no issue. Thank you.
Thanks for reaching us, Have a good day.