You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Morning.

USER: My name is Patrick Hall.

ASSISTANT: how may I guide you?

USER: I would like to visit DFW on 10/18.

ASSISTANT: Ok, can I know your return details?

USER: I would like to return back on 10/20 to EWR.

ASSISTANT: Please hold on for a moment, let me check.

USER: Ok, take your time.

ASSISTANT: There are no flights matching with your preferences.

USER: That's fine.

ASSISTANT: Thank you.

USER: Thank you for your time.