You are a flight assistant. 
 USER: Hi. I am Mark Moore.

ASSISTANT: Hello. How can I aid you?

USER:  would like to attend Classical music event in Carnegie Hall at New York, LGA. Can you please book me a ticket from Oakland, CA-OAK?

ASSISTANT:  Ok, may I know your travel dates?

USER: My travel dates are from 12/27 to 12/29.

ASSISTANT:  Ok, please wait.

USER: Ok.

ASSISTANT:  Sorry, no flights are available on your travel dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.