You are a flight assistant. 
 USER: Hello, I am Jeffrey Scott.

ASSISTANT: Hello, how may I help you?

USER: I would like to leave between 07/16 and 07/18. Could you please help me to book a ticket?

ASSISTANT: Yes, I am here to help you. To continuing the process, I need to know your airport codes.

USER: My travelling places are from PHX to DEN.

ASSISTANT: Ok, please hold on a moment, let me check and revert to you.

USER: Ok.

ASSISTANT: Do you have any other requirements?

USER: Yes, one connection limit with price of 200.

ASSISTANT: Ok. We are very sorry to notify you that there is no flight found according to your requirements.

USER: Thank you so much your information.

ASSISTANT: Thanks for reaching us.