You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Stephanie Carter. Due to an emergency meeting I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: OK, not a problem.

ASSISTANT: Thanks for choosing us.

USER: Thanks for the information.