You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Due to heavy rainfall, I would like to change my existing reservation. Please help me out.

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Sure, my name is Jacob Anderson.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Jacob, there is no reservation found active under your name to do modifications in that.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us.