You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you please help me to book a flight ticket from OAK to DFW?

ASSISTANT: Sure, let me know the planned travel dates.

USER: My travelling dates are Oct 5 to Oct 7.

ASSISTANT: Do you have any specifications in connection limit?

USER: I need a single connection of flight.

ASSISTANT: Do you have any class or airline preferences?

USER: I prefer to fly in big brand airlines.

ASSISTANT: Please provide me the name to reserve the ticket.

USER: Myself Kimberly Martinez.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: Ok, no problem, thanks for your information.

ASSISTANT: Thank you for reaching us.