You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning to visit Dallas, can you please book me a ticket from OAK to DFW?

ASSISTANT: Sure, can I know your travelling dates?

USER: My preferable journey dates are Nov 28 and Nov 30.

ASSISTANT: May I know your connection limit?

USER: I prefer connecting flight for this trip.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Charles Edwards.

ASSISTANT: Sorry, there are on flights available on your travelling dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for reaching us.