You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what service you need from our agency?

USER: I am Stephen Taylor, planned for a holiday trip in this week. But it was postponed to next week. Can you help me to change my reservation?

ASSISTANT: Sure. I will assist you. Please allow me few seconds to check your recent reservation.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you, I am unable to find your reservation in our chart list.

USER: That is fine, not an issue.

ASSISTANT: Do you need any other help?

USER: No, thank you.

ASSISTANT: Ok, thank you for connecting us, hope you will reach us in future.