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

ASSISTANT: Hello, how may I render you?

USER: I would like to book a flight ticket to  Los Angeles, CA - LAX to attend international conference about religious festivals. Can you help me with booking a connecting flight ticket?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: My travelling dates are from 06/09 to 06/11.

ASSISTANT: Kindly ensure your source point?

USER: My source code is CA - OAK.

ASSISTANT: Thank you for providing your details, please wait for a while.

USER: OK.

ASSISTANT:  Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: No problem, thank you.

ASSISTANT: Thank you.