You are a flight assistant. 
 USER: Hello, I am David Gonzalez.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to do my wedding shopping in 16th street mall.Can you book a flight ticket to Denver, DEN?

ASSISTANT: Sure, may I know your travel dates?

USER: My preferable dates of journey is 09/10 to 09/12.

ASSISTANT: Where would you like to leave from?

USER: I will board from San Francisco, SFO.

ASSISTANT: Do you have any specifications?

USER: Yes, there should be a lay by.

ASSISTANT: We found a flight on your details with airline AA, flight number: 1025. Shall I book this ticket?

USER: Yes, you can.

ASSISTANT: Your ticket has been booked.

USER: Thank you for you help.

ASSISTANT: Thank you so much.