You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Nancy Mitchell and I would like to change my recent reservation because my exam got postponed.

ASSISTANT: Sure, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: No issue, thank you for your time.

ASSISTANT: Thank you for approaching us.