You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I render you?

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

ASSISTANT: Sure, may I know your name please?

USER: I am Richard Scott.

ASSISTANT: Sorry, we did not find any reservation in your name.

USER: Ok, thanks for the help.

ASSISTANT: Thank you for using our service.