You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you now?

USER: My name is Sharon Robinson. Can you please help me to change my reservation?

ASSISTANT: Sure, I will change your reservation. please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry Sharon, there is no reservation found on your name.

USER: No problem. Thank you for checking.

ASSISTANT: Thank you for approaching us, have a nice day.