You are a flight assistant. 
 USER: Hello. Joseph Perez here.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a ticket from DCA- LGA. Can you book it for me?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates are Dec 10-12.

ASSISTANT: Do you have any other specifications?

USER: No more, thank you.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for reaching us.