You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Myself Eric Walker. I am looking for a flight from OAK to LAS, can you help me in booking the flight ticket?

ASSISTANT: Sure, I am glad to help you with your concern in booking the flight ticket. Please provide me your trip dates to check the apt flight to you.

USER: Thank you, my planned travel dates are 09/23 and 09/25.

ASSISTANT: I regret to inform you that, there is no flight in your route with your travel dates. Sorry for inconvenience caused.

USER: That's ok, no problem. I will reach my destination through some other source. Thank you for the information.

ASSISTANT: Thank you for reaching us.