You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: May I know your desired travel dates please?

USER: My preferable journey dates are from 01/31 to 02/02.

ASSISTANT: There is no flight on your desired travel dates. May I know your name please?

USER: Ok, not an issue. My name is Cynthia Brown.

ASSISTANT: Thank you for opting us.

USER: Thank you for providing information.