You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency, my planned trip to Navajo adventure got postponed, so I want you to change my existing reservation.

ASSISTANT: Sure, can I have your name please?

USER: Sure, Melissa Gonzalez here.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your given name.

USER: Ok, no worries at all. Thank you for your information.

ASSISTANT: Thank you for opting us.