You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: I want to change my recent reservation as my plan to go for Walt Disney concert hall to watch a character show got postponed. Can you help me in changing the reservation made by name Sandra Adams?

ASSISTANT: Sure, I am here to help you. Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for reaching us.