You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name please?

USER: My name is Brandon Wright.

ASSISTANT: OK Brandon, how can I assist you?

USER: Could you please help with booking a ticket from PHX to OAK.

ASSISTANT: Sure, can you please tell me the travelling dates of your journey?

USER: Departure date is 08/19 and return date is 08/21.

ASSISTANT: OK, please wait for a moment.

USER: Sure.

ASSISTANT: thank you for waiting Brandon, there is no flight found on your requirement.

USER: That's really sad. Anyways, thank you for your help.

ASSISTANT: Thank you.