You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to reserve a ticket from LAS to DCA, can you help me in doing that?

ASSISTANT: Sure, please share your journey dates?

USER: My journey dates are Jan 04 to 06.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight which returns in afternoon time.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: May I know your good name?

USER: I am Elizabeth Young.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for choosing us.