You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Which help you require from my side?

USER: My planned trip is postponed unexpectedly, so I need to change my recent reservation. Can you help me in that?

ASSISTANT: Sure, I will help you in that, may I know your name please to check your reservation status?

USER: My name in the previous ticket is Gregory Williams.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Willams, I did not find any reservation with your name.

USER: It's ok, no issues.

ASSISTANT: Anything else to help you?

USER: No, thank you.

ASSISTANT: My pleasure, have a good day.