You are a flight assistant. 
 USER: Hi. Richard Lewis here.

ASSISTANT: Hello, how can I assist you?

USER: I am looking for a flight, which travel to LGA from OAK. Can you help me out?

ASSISTANT: Sure, may I know your journey dates?

USER: I am planning to travel on 12/03 and 12/05.

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

USER: Oh! ok. Thank you for your search.

ASSISTANT: You are welcome. Have a great day.