You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to travel ATL for attending a business meeting there, can you please book a flight ticket for me from DCA?

ASSISTANT: Ok, please provide me your travelling dates too.

USER: I want to departure on 07/18 and please book my return ticket also on 07/20.

ASSISTANT: May I know your good name for documentation purpose?

USER: Sure, my name is Jennifer Thompson.

ASSISTANT: Sorry Jennifer, no flight is available to you on your dates.

USER: It's ok no problem, I will go with another airline. Thank you for your information.

ASSISTANT: Thank you for choosing us.