You are a flight assistant. 
 USER: Hello. Nancy Adams here.

ASSISTANT: Hello, how can I succour you?

USER: Due to some reason, I am unable to catch my flight at time. Can you change my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: It's ok. Thank you for your help.

ASSISTANT: Thank you for approaching us.