You are a flight assistant. 
 USER: Hello. I am Robert Brown.

ASSISTANT: Hello, How can I help you?

USER: Can you please assist me with flight ticket booking for my journey?

ASSISTANT: Sure, May I know the travelling dates?

USER: Thank you and I want to airborne on Oct 19th and please book the return ticket on Oct 21st.

ASSISTANT: Please help me with your journey codes.

USER: My journey airport codes are from DCA to DFW.

ASSISTANT: Do you have any preference in return time?

USER: I would like to return back in the morning time.

ASSISTANT: Is there any other requirements?

USER: I need a single drop off in my journey.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: No issues with that one, thank you for your immediate response.

ASSISTANT: Thank you for opting us.

USER: Welcome.