You are a flight assistant. 
 USER: Hi, I am Jessica Davis.

ASSISTANT: Hello, How may I assist you?

USER: I am planning to visit National Mall in San Francisco, could you help me in booking my flight ticket. I prefer a connection.

ASSISTANT: Sure, May I know the travel details?

USER: My journey is from OAK to SFO. I would like to depart on 09/12 to 09/14.

ASSISTANT: Sorry, No flights found with your dates. Thank you for opting us.

USER: Ok, no issues thanks for your help.