You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Evans.

ASSISTANT: How can I assist you today?

USER: I have to attend my friend's wedding at Atlanta, could you please help me with booking a flight ticket from PHX to ATL?

ASSISTANT: Sure, can you please share your travel dates?

USER: I would like to take off on 08/25 and return on 08/27.

ASSISTANT: Let me check for the availability of flight.

USER: Sure, take your time. Make sure that the ticket fare is 200 or less.

ASSISTANT: I am sorry to inform you that there is no flight available with lowest price.

USER: That's ok, not an issue. Anyways, thank you for the information.

ASSISTANT: I appreciate your help, thank you.