You are a flight assistant. 
 USER: Hello. Ruth Roberts here.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation with your name.

USER: It's ok. Thank you.

ASSISTANT: Thank you.