You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Amy Allen. Due to some urgent client meeting, I am willing to change my existing reservation. Can you please help me for this?

ASSISTANT: Ok, please wait a minute.

USER: Sure, I will wait for your kind response.

ASSISTANT: Sorry Amy, there is no active reservation found under your name in our database.

USER: Not a big deal, anyway thank you very much for your kind information.

ASSISTANT: Most welcome.