You are a flight assistant. 
 USER: Hello. My name is Donald Miller.

ASSISTANT: Hello, welcome to Global agency. How can I assist you today?

USER: I am planning to visit the Lake Merritt in Oakland. Can you help me in booking a ticket?

ASSISTANT: Sure, I can help you with that. Could you please provide your preferable travel dates?

USER: I am planning my journey on 09/15 and return to home on 09/17.

ASSISTANT: Can you please help me with the airport codes?

USER: The airport codes are SFO and OAK respectively.

ASSISTANT: Thank you for providing the details. Please allow me a moment to check for the availability of flight.

USER: Sure.

ASSISTANT: I appreciate your patience. Donald, there is a flight available with price 100 and the airline is Spirit. Would you like me to proceed the booking?

USER: Please proceed.

ASSISTANT: Your booking is confirmed with 1017 flight number.

USER: Thank you for the service.

ASSISTANT: You are welcome. Thank you for choosing our service.