Hello.
user
Hello, how may I help you?
assistant
My name is Nicole Lopez. I want to book a flight to Houston to meet my mother, can you please help me to book  a flight from Washington DC?
user
Sure, can I know your preferable dates?
assistant
I will depart on July 25th and return back on July 27th.
user
Ok, let me know the airport code of Houston and Washington?
assistant
The airport code for Houston is IAH and Washington DC is IAD.
user
Sorry, there are no flight found on given schedule.
assistant
Never mind, thank you for checking it.
user
Thank you for reaching us.
assistant