You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Donna Nelson here.

ASSISTANT: How can I assist you at this moment?

USER: I would like to change my reservation due to financial issues. Can you help me?

ASSISTANT: Sure, I will help you with this.

USER: Ok.

ASSISTANT: Donna Nelson, there is no active reservation found under your name in our database.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you so much for your help.