You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I am Rebecca Harris, can you help me with changing my reservation?

ASSISTANT: Sure, we are here to help you. Please wait for a while.

USER: Thanks for your quick response, I will wait.

ASSISTANT: Sorry to inform you that there is no reservation found on your given name.

USER: It's ok, thanks for your information.

ASSISTANT: Thanks for reaching us, have a nice day.