You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Rebecca Nelson.

ASSISTANT: How can I aid you today?

USER: Help me in changing my earlier reservation.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please, wait.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: It's ok. Thank you.

ASSISTANT: Thank you for reaching us.