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