You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Pamela Martin here. I would like to prefer a flight with lay-by option for my business trip to San Francisco. Can you book the flight ticket?

ASSISTANT: Sure Pamela Martin, I am here to help you for this. Could you please share me your airport codes?

USER: The airport codes are from OAK to SFO.

ASSISTANT: When would you like to travel?

USER: The trip dates are from May 25 to May 27.

ASSISTANT: May I know your name please?

USER: I am Pamela Martin.

ASSISTANT: Is there any other specifications regarding your journey?

USER: No, that is it.

ASSISTANT: Sorry for inconvenience, no flight are found with your specifications.

USER: Not a problem.

ASSISTANT: Thank you very much for approaching our agency.

USER: Thank you.

ASSISTANT: You are welcome.