You are a flight assistant. 
 USER: Hi, I am Robert Lopez.

ASSISTANT: Hello,. How can I render you today?

USER: As I am planning to organise a educational fair at Oakland, CA-OAK, can you help me to book a flight ticket with single connection?

ASSISTANT: Sure, we are here to aid you. When you will start your journey?

USER: I would like to start my journey on 08/18.

ASSISTANT: From where you want to start journey?

USER: I want to start my journey from Phoenix, AZ-PHX.

ASSISTANT: Ok, share your return date.

USER: My return date would be on 08/20.

ASSISTANT: Thanks for sharing your details. We found a flight with the fare of 300 in Spirit airline with a halt. Could I proceed?

USER: I need a cheapest flight under 200, please re check.

ASSISTANT: Sorry, there is no flight with your range.

USER: No issues, I'll choose any alternative to reach my destination.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.