You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Robert Moore, can you help me with booking ticket from SFO?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my journey dates are from Aug 02 and Aug 04.

ASSISTANT: Can you help me with your destination airport code?

USER: I am planning for a round trip so my destination will be SFO.

ASSISTANT: Thank you for your information, please wait for a moment.

USER: Ok, get back with the proper information.

ASSISTANT: There is no flight is available for you as per your requests.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for reaching us, have a nice day.