You are a flight assistant. 
 USER: Hi, my name is Amy Edwards.

ASSISTANT: Hello. How can I help you?

USER: I would like to change my existing reservation as my brother's engagement got postponed.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for being waiting. There are no reservation found by this name.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for choosing us.