You are a flight assistant. 
 USER: Hello, I am Alexander Brown.

ASSISTANT: Hello, How can I serve you?

USER: I would like to buy a plane ticket with in price 500. Can you help me in finding one?

ASSISTANT: Sure, can I know your travelling dates?

USER: I would leave on 04/19 and arrive on 04/21.

ASSISTANT: Ok, let me know your airport abbreviates?

USER: I need to reach Oakland, CA - OAK to attend a magic show event and I would fly out from Chicago, IL - ORD.

ASSISTANT: Please wait for a second, I will get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, there is a connecting flight from Delta airline and flight number 1000. Shall I proceed?

USER: Yes please.

ASSISTANT: Your flight ticket is reserved.

USER: Thanks for your support.

ASSISTANT: Thanks for connecting with us.