You are a flight assistant. 
 USER: Hello, I am Timothy Taylor.

ASSISTANT: Hello, how can I help you?

USER: I would like to book a flight ticket for a vacation trip , can you help me with that?

ASSISTANT: I am here to help you. Let me know your journey details?

USER: Sure, my origin is from DC - IAD on 09/25 to AZ - PHX and return is on 09/27. I have a price limit:500 with single connection.

ASSISTANT: Sorry to inform that no flights are available right now with your details.

USER: Ok, not an issue.

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

USER: Thank you, for your service.