You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Dorothy Davis is here. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: Thank you for your help, we did not find any active reservation in your name to make changes further.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.