You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to 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 on which name the ticket has been reserved?

USER: Sure,  my previous reservation is on the name of Rebecca Roberts.

ASSISTANT: Can you please wait for a moment, I will check with your reservation.

USER: Sure.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thank you.