You are a flight assistant. 
 USER: Hello. My name is Emma Allen.

ASSISTANT: Hello, how can I guide you?

USER: I would like to change my reservation, could you help me out?

ASSISTANT: Sure, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no active reservation found on your name in our database to change.

USER: That's ok. Thank you, have a good day.

ASSISTANT: Thank you for approaching us.