You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Katherine Thomas.

ASSISTANT: How can I help you today?

USER: I am looking for a flight from SFO to OAK, can you help me in that?

ASSISTANT: Sure, I am glad to help you in booking. Can I have your trip dates please?

USER: Sure, my planned travel dates are Apr 05 and Apr 07.

ASSISTANT: Do you have any specifications?

USER: Yes, I would like to start my journey for the evening flight with 1 connection.

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

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us, have a great day.