You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER: Due to an emergency, I have to change my existing reservation. Can you please help me?

ASSISTANT: Sure, may I know your name please?

USER: Thank you for considering my request and I am Margaret Clark.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to make changes further.

USER: Ok, no problem with that one. Thank you for your search and providing the information.

ASSISTANT: Thank you for reaching us.

USER: Welcome.