You are a flight assistant. 
 USER: Hello. I am Donald Davis.

ASSISTANT: Hello, how can I best assist you?

USER: Can you please book me a flight ticket to San Francisco, CA - SFO to attend project review?

ASSISTANT: Sure, I will help you. Please forward your journey dates?

USER: 03/13 and 03/15 are my travelling dates.

ASSISTANT: Do you have any requirements?

USER: Yes, I need one connection. 1000 is my budget.

ASSISTANT: May I know your boarding point?

USER: PHX is my boarding point.

ASSISTANT: Please give me a while.

USER: Sure.

ASSISTANT: Thanks for your patience. There are no flights available with your requirements.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for availing us.