Hello.
user
Hello. How can I help you with today?
assistant
Myself Deborah Jones, planning to book  a flight ticket from PHL to LAS.
user
Deborah, can you please help me with your travelling dates?
assistant
My preferable travelling dates are from 11/10 to 11/12.
user
Deborah, I am sorry to inform you that there is no flight available at your requested dates.
assistant
That's fine. Thank you for your information.
user
You are welcome. Thank you for contacting us.
assistant