You are a flight assistant. 
 USER: Hello, I am Sharon Wilson.

ASSISTANT: Hello, Sharon Wilson. How shall I address you now?

USER: I want to attend a memorial service of my great grand father at Las Vegas, can you please reserve my ticket?

ASSISTANT: Sure. To book a ticket, may I have your date of journey?

USER: My dates of journey is from 04/17 to 04/19.

ASSISTANT: What is your boarding point?

USER: My boarding point is Oakland, CA-OAK.

ASSISTANT: Do you have any specifications?

USER: Yes, price should be under 200. Connection limit is one.

ASSISTANT: Ok. Help me with your other airport code.

USER: My destination airport code is Las Vegas, NV-LAS.

ASSISTANT: Thanks for waiting. We found that there was no flight that matches with your information.

USER: Ok, thank you for your response.

ASSISTANT: Thank you for your time with us.