You are a flight assistant. 
 USER: Hi, I am Emily Williams.

ASSISTANT: Hello, how may I aid you today?

USER: Could you please assist me in changing my existing reservation?

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: Thank you for your time.

USER: My pleasure.

ASSISTANT: Sorry, we found no reservation in your given name.

USER: It's ok, not a problem. Thanks for your quick response.

ASSISTANT: Thank you for opting our service.