You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Benjamin Robinson. I want to start a new gym training center at Phoenix AZ-PHX, help me in booking my flight ticket from San Francisco CA-SFO.

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

ASSISTANT: May I know your journey dates to proceed further?

USER: My travelling dates will be 07/23 to 07/25.

ASSISTANT: Ok, do you need any halt?

USER: I am flexible with any flight.

ASSISTANT: Ok, please provide your price limit.

USER: My price limit is up to 200.

ASSISTANT: Ok, please standby.

USER: Sure.

ASSISTANT: Thank you for waiting, There were no flights found with your given specifications.

USER: Please proceed.

ASSISTANT: Sorry, we did not find any flights.

USER: Its ok, thank you.

ASSISTANT: Thank you for choosing us.