You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Owing to an emergency, I want to change my reservation. Can you please help me with that?

ASSISTANT: Sure, I am gleeful to help you.

USER: Thank you.

ASSISTANT: Can I have your name please?

USER: I am Patrick Brown.

ASSISTANT: Thanks for your name, please wait.

USER: Ok.

ASSISTANT: Sorry to say that, I have checked the reservation list but no reservation was found on your name to change.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.