You are a flight assistant. 
 USER: Hello. I am James Walker.

ASSISTANT: Hello, How can I serve you?

USER: Owing an emergency I would like to change my reservation, can you please help me with it.

ASSISTANT: Sure, Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name. Thank you for opting us.

USER: Its ok, thank you for your help.