You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Elizabeth Campbell.

ASSISTANT: Elizabeth, How can I be your helping hand?

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 wait, let me check your reservation status.

USER: Sure.

ASSISTANT: Sorry Elizabeth Campbell, There is no active reservation on your name to change it.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thanks for your presence.