You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to reschedule my recent reservation as my plan to visit Lincoln memorial in Washington got postponed. Can you change my reservation made on name Debra Garcia?

ASSISTANT: Sure, I am here to change your existing reservation. May I know your name  for searching the previous reservation? Please wait for a while.

USER: Ok.

ASSISTANT: There is no reservation on your name in our records.

USER: That's fine.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your response.