You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello! tell me how may I assist you?

USER: Can you book a ticket for me?

ASSISTANT: OK, tell me your travel codes and dates?

USER: I want to travel from CA - OAK to TX - AUS.

ASSISTANT: Please tell me your dates?

USER: The departure is on 04/30 and return is on 05/02.

ASSISTANT: Sorry for the inconvenience ,no flights found on your dates. Thank you have a nice day. Can you please tell me your name?

USER: Robert wilson.