You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I'm Stephanie Clark. My examination scheduled dates has been postponed.So, I would like to change my recent reservation which is under my name. Can you please help me with that?

ASSISTANT: Sure, I'm here to help you. Hold on for a moment please.

USER: Thank you.

ASSISTANT: I found a reservation for you. Can I know your new journey details please?

USER: Sure it is from CLT to PHX.

ASSISTANT: Can I know your travel dates please?

USER: My departure date is on 06/26 and the return date is on 06/28.

ASSISTANT: Ok, hold on for a moment please. Let me check the best flight.

USER: Sure, take your time.

ASSISTANT: Sorry to say this Clark, there are no flights on your requested dates.

USER: Ok, no issues.

ASSISTANT: Sorry for the inconvenience provided.

USER: Thank you for checking.

ASSISTANT: Thank you for reaching us. Have a great day.