You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to change my reservation as my plan to go for a heritage tour in PHX got postponed. Can you help me?

ASSISTANT: Sure, can I know your name?

USER: I am Debra Lewis.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: Ok fine, thanks for your assistance.

ASSISTANT: Thank you for reaching us.