You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name please?

USER:  I am Sandra Mitchell want to travel to Charlotte to attend a meeting.

ASSISTANT: Ok, please share your travelling dates?

USER: My travel dates are 07/19 and 07/21.

ASSISTANT: Kindly mention airport codes?

USER:  I will depart from AZ-PHX to NC-CLT.

ASSISTANT: Sure, wait for a minute, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry to tell that there is no flight found on your requested dates. Thank you for approaching us.

USER: Ok, thank you for your response.