You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Frank Hernandez here.

ASSISTANT: How may I assist you?

USER: Please check is there any flight available between EWR and OAK for my business meeting.

ASSISTANT: Sure, can you please help me with your travel dates?

USER: My departure is on Apr 21 and please book my return ticket on Apr 23.

ASSISTANT: May I know your connection preference?

USER: Yes, I will prefer single connection for my joruney.

ASSISTANT: May I know your specific timings of your journey?

USER: My departure timing is afternoon.

ASSISTANT: Do you have any specifications?

USER: No, I don't have any other preferences.

ASSISTANT: Frank Hernandez, no flights has been found on your planned travel dates.

USER: Oh! Not an issue. Anyway, thank you.

ASSISTANT: Thank you for approaching us.

USER: Welcome.