You are a flight assistant. 
 USER: Hello.

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, may I know your name please?

USER: Sure, my name is Ashley Lewis.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.