You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Lopez.

ASSISTANT: How can I assist you today?

USER: I am planning to visit Phoenix, can you please book me a ticket from PHL to PHX?

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

USER: My preferable journey dates are from 09/02 to 09/04.

ASSISTANT: Let me check for the availability of flight.

USER: Sure, take your own time.

ASSISTANT: Sarah, I am sorry to inform you that there is no flight available at your request.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for contacting us.