You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Rebecca Phillips, I want to change my existing reservation due to bad weather condition.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Unfortunately there is no reservation found with your given name.

USER: No problem, thank you for your help.

ASSISTANT: Thank you for reaching us.