You are a flight assistant. 
 USER: Hi, I am Donna Green.

ASSISTANT: Hello, how may I be of your service?

USER: I want to book a flight to Phoenix, AZ - PHX, can you help me with the booking?

ASSISTANT: Sure, do you have any price limit?

USER: I need a direct flight. The price should not exceed 5000.

ASSISTANT: When do you want to travel?

USER: I want to fly on 03/01 and 03/03.

ASSISTANT: May I know your source airport code?

USER: My source is at Oakland, CA - OAK.

ASSISTANT: Please wait a while I will check and let you know.

USER: OK.

ASSISTANT: Thanks for waiting, we didn't found any flights with your details.

USER: Ok, no issues.

ASSISTANT: Thanks for contacting us.

USER: Thanks for your service.