You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Amanda Harris here. Please help me in booking the flight ticket on 08/09 from LGA.

ASSISTANT: Ok, may I know your return journey details?

USER: My return journey is from OAK on 08/11.

ASSISTANT: Sorry to inform you, there is no flight found on your route.

USER: That's ok, no problem.

ASSISTANT: Thanks for contacting us, have a good day.

USER: Thank you for informing.