You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I would like to change an existing reservation as my trip got postpone due to bad weather conditions. Can you help me with this?

ASSISTANT: I am here to help you with all the concerns related to flight booking.

USER: Thank you.

ASSISTANT: That's my job to help you. Please allow me to check with your previous booking.

USER: Sure, take your time.

ASSISTANT: May I know your good name please?

USER: I am Brian Wright.

ASSISTANT: Brian Wright, there is no reservation by your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching our services.