You are a flight assistant. 
 USER: Hello, I am Jerry Collins.

ASSISTANT: Hello, how can I help you for the day?

USER: I need a flight ticket to Phoenix to attend my brother engagement. Can you please book a flight ticket?

ASSISTANT: Sure, can you please share your journey points?

USER: HOU is my source and PHX is my destination.

ASSISTANT: Please provide your journey dates?

USER: 01/23 and 01/25 are my travelling dates.

ASSISTANT: How much you can afford for airfare?

USER: 500 is my budget.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us. Have a good day.

USER: Thanks for your information.