You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you today?

USER: My name is Eric Green. I want to book a flight ticket from Phoenix, AZ-PHX to Oakland, CA-OAK.

ASSISTANT: Sure, Eric. May I please know your journey date?

USER: My departure date is on Jan/7 and my return date is on Jan/9.

ASSISTANT: OK. Do you have any other preference regarding the flight?

USER: Yes, I have one connection limit with price limit of 1000.

ASSISTANT: Please, give me a moment to check and I will get back to you.

USER: OK, I will wait.

ASSISTANT: Thanks for your patience. But, I am sorry to say that there is no flight available regarding your requirement.

USER: Not a problem, thanks for your information.

ASSISTANT: Thanks for contacting us. Have a nice day.