You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I have made a reservation earlier but unknowingly I provide wrong dates, so I want to change my reservation. Can you help me with that?

ASSISTANT: May I know your name?

USER: My name is Gary Miller.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to inform, no reservation found with your name.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for reaching us.