You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Linda Hernandez, I want to book a flight ticket on 02/14 to meet my friend at Washington.

ASSISTANT: Ok.

USER: Can you book a connecting flight for me?

ASSISTANT: Sure. When you will catch the return flight?

USER: I need a return flight on 02/16.

ASSISTANT: May I know your airport codes?

USER: My source airprot is NV-LAS and landing airprot is DC-IAD.

ASSISTANT: Please, wait.

USER: Sure.

ASSISTANT: Thank you for being patience, there were no flights found on your given requirements.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.