You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, What kind of help are you expecting from our side?

USER: Can you aid me to change my reservation due to emergency?

ASSISTANT: Sure, I am happy to help you to change the ticket details once I have found your ticket. Can I know your name please?

USER: Brandon Perez here.

ASSISTANT: Ok, wait for some time I will check the reservation on your name and get back to you.

USER: Sure, I will wait for your response.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: Thank you  for the help.

ASSISTANT: Thanks for approaching us.