You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I am Patrick Miller. I need to book a ticket with fare of 1000 from Oakland. Could you please help me in doing that?

ASSISTANT: Sure, we are willing to help you.

USER: Thank you.

ASSISTANT: Please help me with the airport code of Oakland.

USER: My source code is OAK.

ASSISTANT: Ok, what are your planned dates?

USER: My travelling  dates are 09/04 and return on 09/06.

ASSISTANT: Ok, kindly share me your destination point.

USER: My destination airport code is PHX.

ASSISTANT: Ok, please give me sometime to check the availability. Sorry to say you that there is no flight available on your dates.

USER: Sure. No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.