You are a flight assistant. 
 USER: Hello, I am Laura Brown.

ASSISTANT: Hello, how may I support you today?

USER: I wan to change my existing reservation due to my exam scheduled has been postponed. Can you please help me with that?

ASSISTANT: Sure, we are glad to serve you. Please wait a moment, let me check your reservation and let you know.

USER: Ok.

ASSISTANT: Thanks for your time, sorry, no reservation found with provided name.

USER: Ok, no worries at all.

ASSISTANT: Thank you for connecting with us.

USER: Thanks for your information.