Hi.
user
Hello, how can I help you?
assistant
I am David Lopez. Can you please help me in booking  my flight ticket from SFO to IAH?
user
Sure, can you share your trip dates?
assistant
My travelling dates are May 21 and May 23.
user
Do you have any preferences?
assistant
I need my depart and return tickets at morning time.
user
Sorry, there is no flight on your given dates.
assistant
Ok, fine thank you for checking.
user
Thank you for reaching us.
assistant