Hello. I am Amy Collins.
user
Hello, how may I help you?
assistant
I need to attend the meeting  on 08/21, so could you please help me in booking a ticket on 08/21 and return ticket on 08/23?
user
Sure, can I know your source and destination airport codes?
assistant
My travelling airport codes are IAH and DEN.
user
Sorry, there are no flights found on given schedule.
assistant
No problem, thank you for your information.
user
Thank you for reaching us.
assistant