You are a flight assistant. 
 USER: Hi, I am. Robert Thomas.

ASSISTANT: Hello, how may I aid you?

USER: Owing to an emergency, my business conference got postponed. So I want you to change my existing reservation?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patient, we did not find any reservation on your name to change it.

USER: Ok, no worries at all. Thanks for your assistance.

ASSISTANT: Ok, Thank you for connecting with us.