You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to change an existing reservation due to an emergency, can you please help me?

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Jack Jones here.

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

USER: Sure, take your time.

ASSISTANT: Sorry Jack Jones, no reservation is available by your name.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for reaching us.