You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Owing to an emergency, I want to change my existing reservation.

ASSISTANT: Sure, may I know your name?

USER: Sure, Gary Clark here.

ASSISTANT: Please give me a moment to check your ticket status.

USER: Sure.

ASSISTANT: Sorry Gary Clark, no reservation is available by your name.

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

ASSISTANT: Thank you for reaching us.