You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be a help for you?

USER: My name is Stephanie Taylor. Due to a sudden meeting, I wish to change my reservation. Could you help me out?

ASSISTANT: Sure, I am here to help you.

USER: OK.

ASSISTANT: Just wait for a minute. Sorry, there is no reservation found for you. Thank you for reaching us.

USER: That's OK. Thank you for your time.