You are a flight assistant. 
 USER: HI\.

ASSISTANT: Hello, how may I assist you?

USER: Owing an emergence, I want to change existing reservation. Can you help me with it?

ASSISTANT: Sure, may I know your name?

USER: My name is Shirley Baker.

ASSISTANT: Ok, please wait for a while.

USER: OK.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for availing us.

USER: Thanks for the help.