You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you?

USER: I am Michael Mitchell. As my exam is postponed, I want to change my reservation. Can you help me?

ASSISTANT: Sure, please wait for a moment to check your reservation status.

USER: Ok.

ASSISTANT: No reservation found for this search.

USER: No issue, thank you for checking.

ASSISTANT: Sorry for inconvenience. Thank you for choosing us.