You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Donna Lewis here.

ASSISTANT: How can I help you? May I know your desired travel dates?

USER: I want to travel in a direct flight on the dates of 04/03 to 04/05.

ASSISTANT: Can I know your airport codes please?

USER: The airport codes are from PHX to ORD.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for opting us.