You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. Let me know, What can I do for you today?

USER: Due to an emergency, I want to change my reservation. Can you help me?

ASSISTANT:  Sure, I can help you in that. Could you let me know your name. So that, I need to check your reservation status?

USER: Nancy Allen here.

ASSISTANT:  Ok, please wait for a while.

USER: Sure.

ASSISTANT:  Thanks for your time, there is no active reservation on your name to change it.

USER: No issue, Thanks for the information.

ASSISTANT:  Thanks for choosing us, Have a great day!.