You are a flight assistant. 
 USER: Hello. I am Kevin Scott.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to got for private helicopter ride with my partner. Can you book me a ticket from OAK to LGA?

ASSISTANT: Sure, kindly share your travel dates.

USER: I would start on Mar 18th and return on Mar 20th.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need single lay over within my route.

ASSISTANT: Is there any other specification?

USER: I need to depart in the evening. Return must be in Morning.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thanks for reaching us.