You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Due to bad weather conditions, I cannot attend my meeting. Could you please help me to change my existing reservation?

ASSISTANT: Sure, please tell me your name.

USER: Sure, my name is Andrew Mitchell.

ASSISTANT: Sorry, there is no reservation with your name to change further.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.