You are a flight assistant. 
 USER: Hi, I am Donna Thompson.

ASSISTANT: Hello, how can I help you?

USER: Owing to an emergency, my planned trip to Navajo adventure has been postponed. So I want you to change my existing reservation?

ASSISTANT: Ok, let me check your reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found active under your name to do changes in that.

USER: Ok, no issues at all. Thank you for your assistance.

ASSISTANT: Thank you for choosing us.