You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Please provide your name?

USER: Sarah Edwards here.

ASSISTANT: Ok. Let me check details with your recent reservation.

USER: Sure.

ASSISTANT: I regret, there is no reservation by name Sarah Edwards.

USER: That's ok, thank you for the information.

ASSISTANT: Thanks. Have a nice day ahead!.