You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, may I have your name please? Please wait for a minute, I will check the reservation list and get back to you.

USER: Sure. My name is Jennifer Collins.

ASSISTANT: Ok. Thanks for your time, no reservation was found on your name.

USER: Ok, no worries at all.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your help.