You are a flight assistant. 
 USER: Hi.

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

USER: I would like to change my flight reservation as I am sick, can you please help me?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: On whose name, you want to change the reservation?

USER: I am Rebecca Perez.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found on your name to change.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thank you for choosing us.