You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my existing reservation due to bad weather condition, can you please help me with that?

ASSISTANT: Sure, may I know your name to check for the previous reservation.

USER: My name is Rebecca Baker.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: Rebecca Baker, there is no reservation found under your name.

USER: No problem, thank you.

ASSISTANT: Thank you for contacting us.