You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Carolyn Hall. I want to change my existing reservation due to bad weather condition, can you help me in that?

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: No problem, thank you for your help.

ASSISTANT: Thank you for reaching us.