You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Richard Robinson here. I would like to take my children to Phoenix, Could you please help me to book a flight ticket from SFO to PHX?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, my desired trip dates are July 05 and July 06.

ASSISTANT: At what price range are you looking for?

USER: I can afford 200 only.

ASSISTANT: Sorry, there is no flight on your details.

USER: No problem, thank you for checking.

ASSISTANT: Thank you.