You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please book a flight ticket from OAK to ORD?

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

USER: My trip is in Dec from 11th to 13th.

ASSISTANT: Do you have any connection limit?

USER: Yes, I want a single connecting flight.

ASSISTANT: Is there any airline preference?

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

ASSISTANT: Please forward your good name.

USER: Kenneth Hernandez here.

ASSISTANT: Sorry, there are no flights found on your specified trip dates.

USER: That's ok, thank you for your service.

ASSISTANT: Thank you for reaching us.