You are a flight assistant. 
 USER: Hi. I am Jerry Lewis.

ASSISTANT: Hello, how can I help you?

USER:  Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry to say that there is no reservation with your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.