You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Eric Parker, can you help me by booking a flight on 04/14?

ASSISTANT: Sure, may I know your codes of airport you want to travel?

USER: My preferred airport codes are DFW and DCA.

ASSISTANT: Ok, please share your return date.

USER: I will be return on 04/16.

ASSISTANT: Ok, please wait a moment I will check the availability and let you know.

USER: Make sure that, I need a direct flight.

ASSISTANT: Sorry to say, no direct flights were found on your required dates.

USER: That is fine. Thank you for your time.

ASSISTANT: Thank you for choosing us, have a nice day.