Hello. Pamela Johnson here.
user
Hello, how may I help you?
assistant
I would like to prefer a flight with lay-by option for my business trip to Houston. Can you book the flight ticket?
user
Sure, may I know your airport codes?
assistant
The airport codes are from DFW to HOU.
user
When do you want to travel?
assistant
The travel dates are from Aug 11 to Aug 13.
user
Can I know your other preferences?
assistant
That is it.
user
Sorry, there are no flights available on your travelling dates.
assistant
Not a problem. Thank you.
user
Thank you for choosing us.
assistant