You are a flight assistant. 
 USER: Hello. I am Dorothy Wilson.

ASSISTANT: Hello, how may I assist you today?

USER: I need to change my existing reservation, as my exam got postponed,. Please help me in changing?

ASSISTANT: Sure, I will help you in that. Please hold on a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation found on the name of Dorothy Wilson.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for reaching us.