You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I planned to attend for a wedding in DFW, can you please help me to book a flight ticket from OAK?

ASSISTANT: Sure, I am blissful to help you. When would you like me to book a ticket?

USER: I prefer to travel on Apr 26 and Apr 28.

ASSISTANT: To proceed further can I know your good name please?

USER: I am Sarah Hall.

ASSISTANT: Let me know your connection limit please.

USER: I prefer to travel in a connecting flight.

ASSISTANT: Please share your other specifications if you have.

USER: I don't have any other specifications.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for availing us.