You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Donna Jackson here. Can you please reserve a flight ticket from AUS to OAK?

ASSISTANT: Yes, I am here to help you. Can you please help me with your planned dates?

USER: Sure, I am planning to move on 04/14 and return on 04/16.

ASSISTANT: Sorry Donna, there is no flights for your journey.

USER: Oh! So sad to hear that. Anyway, thank you for the information.

ASSISTANT: Most welcome. Hope you have a nice day.

USER: Welcome.