You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Amy Collins.

ASSISTANT: How can I assist you?

USER: I'm planning to visit Denver Botanical Gardens, can you please book a ticket from SFO to DEN?

ASSISTANT: Can I know your travel dates?

USER: My preferable dates are from 09/30 to 10/02.

ASSISTANT: Give me a minute, let me check the details.

USER: Ok.

ASSISTANT: The flight 1015 of Spirit airlines is available on your request. Shall I book the ticket?

USER: Ok, please confirm the ticket.

ASSISTANT: Your ticket is booked.

USER: Ok, thank you for your immediate response.

ASSISTANT: Welcome.