You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you at this moment?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Sure, Emma Edwards here.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for approaching us.