You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Nancy Miller.

ASSISTANT: May I know, On what purpose you have reached us?

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

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Please hold on, let me check your reservation status.

USER: Sure.

ASSISTANT: Sorry Nancy Miller, there is no active reservation on your name to change it.

USER: Ok, no issues. Thanks for your kind service.

ASSISTANT: Thanks for approaching us.