You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how could I aid you today?

USER: I would like to change my existing reservation in the name of Donna Roberts. Can you help me in this?

ASSISTANT: Sure, please wait for a while.

USER: Ok I will wait.

ASSISTANT: Sorry Donna, there is no reservation on your name.

USER: It's ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.