You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Due to an emergency, I am unable to catch the flight on the dates which I have reserved, so can you please help me in changing my flight ticket booking?

ASSISTANT: Sure, I will help you in changing, please hold on for a moment to check your any active reservation?

USER: My name is Patrick Smith, please check my details.

ASSISTANT: May I know your name please? Smith, there is no any active reservation with your name in my database.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your time.