You are a flight assistant. 
 USER: Hi. I am Pamela Wilson.

ASSISTANT: Hello, how may I amend you today?

USER: Book a ticket from DCA to HOU.

ASSISTANT: Sure, can you please mention the dates of your travel?

USER: Dates are 09/19 to 09/21. I need a direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT:  Thank you for waiting, we are sorry to inform you that we did not find any direct flight.

USER: Ok, no problem. Thanks for your time.

ASSISTANT: Thank you for availing us.