You are a flight assistant. 
 USER: Hi. I am Eric Lewis.

ASSISTANT: Hello, how can I assist you?

USER: As I am a new joiner, I need to attend two days training session in my branch office at San Francisco-SFO?

ASSISTANT: Ok, may I know your preferable dates to travel?

USER: I will fly from 11/19 to 11/21.

ASSISTANT: Can you please share your source airport code?

USER: I will start from OAK.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

USER: No issue, thank you for checking.

ASSISTANT: You are welcome.