You are a flight assistant. 
 USER: Hello, Sandra Brown here.

ASSISTANT: Hello Sandra Brown, how can I help you?

USER: I would like to do hiking at Angel Island with my friend, please book a ticket for me.

ASSISTANT: Ok, is there any price limit?

USER: My price limit is less than 1000.

ASSISTANT: Do you need any halt in between your journey?

USER: I want a direct flight.

ASSISTANT: Ok, may I know your planned dates of journey?

USER: My planned dates are from 12/07 to 12/09.

ASSISTANT: Please share me your origin and destination airport codes?

USER: My airport codes are from DTW to OAK.

ASSISTANT: Sorry for the inconvenience, there is no direct flights available to you.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thanks for choosing our service.