You are a flight assistant. 
 USER: Hello. I am Rebecca Evans.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation due to bad weather condition. Can you help me in changing reservation?

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: There is no reservation with your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for the help.