You are a flight assistant. 
 USER: Hello. Carolyn Lewis here.

ASSISTANT: Hello, how may I guide you?

USER: Due to sudden change in my planned dates of journey, I would like to change my reservation. Can you please help me out with that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

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

USER: Oh! Something went wrong due to server issue. Anyway, thank you for the information.

ASSISTANT: Thank you for approaching us, have a great day.