You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Jonathan Hill. 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 moment.

USER: Ok.

ASSISTANT: There is no reservation on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.