You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am Michelle Carter. I need to book a ticket to meet my uncle and aunt on 11/29. Could you please help me in booking a ticket on 11/28?

ASSISTANT: Sure, May I know the journey codes?

USER: My source and destination points are ATL and DCA.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: No worries, thank you for your valuable information.

ASSISTANT: Thank you.