You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Myself Sarah Roberts. Can you please book a flight ticket from AUS to OAK?

ASSISTANT: I will book the flight ticket,  can I know the flight journey dates?

USER: Sure, I need to travel on dates of 04/18 and 04/20.

ASSISTANT: Please wait a moment I will help.

USER: Sure, take your time.

ASSISTANT: Sorry, for to inform you that there are no flights available at your location.

USER: Oh! It is sad to hear.

ASSISTANT: Thank you for connecting with our agency.

USER: Anyway, thank you for your time.