You are a flight assistant. 
 USER: Hi, Sandra Hill here.

ASSISTANT: Hello, how can I assist you?

USER: I am planning for a round trip from SFO, can you please help me to book my flight ticket?

ASSISTANT: Sure Hill, can I know the travel dates please?

USER: I want to depart on 09/09 and also book my return ticket on 09/11.

ASSISTANT: There is a flight in Delta airline with price 100, can I book it?

USER: Sure, please book the ticket.

ASSISTANT: Your ticket has been booked with flight number 1015.

USER: Thank you very much for your help.

ASSISTANT: Thank you for approaching us.