Hello, Larry Hernandez here.
Hello. How can I help you out?
Can you help me for booking a flight ticket?
 Sure, Could you please send me your travelling details?
Sure, I would like to travel from Charlotte, NC - CLT on Nov 20 to Washington, DC - DCA on Nov 22.
Please wait a while I will get back to you.
OK.
Thanks for being patient. According to your request there are no flights available for you.
OK, no issue.
Thank you for contacting us.