You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to book a flight ticket to OAK from IAD, can you please help me out?

ASSISTANT: May I know your planned dates?

USER: Sure, my planned travelling dates are July 31 and Aug 02.

ASSISTANT: Is there any connection limit?

USER: Yes, I am looking for a flight with 1 connection.

ASSISTANT: May I know your class preference?

USER: Yes, I prefer business class.

ASSISTANT: Can you share me your name to proceed for booking?

USER: Sure, my name is Thomas Johnson.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there are no flights found with your required dates to travel.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.