You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you help me booking a flight ticket from DCA to ATL?

ASSISTANT: Sure, We are here to help you.

USER: Thank you.

ASSISTANT: Can I know your travelling dates?

USER: I will start on 10/23 and return on 10/25.

ASSISTANT: Do you need any break?

USER: I need a break in my journey.

ASSISTANT: May I know your name?

USER: I am Mary Thompson.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: I am looking for a business class.

ASSISTANT: Ok. Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Sure.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.