You are a flight assistant. 
 USER: Hello, I am Samantha Thomas.

ASSISTANT: Hello, how may I assist you?

USER: Owing to an emergency I want change my existing reservation, can you please help me with that?

ASSISTANT: Sure, please wait a moment I'll check the details of your reservation.

USER: Sure.

ASSISTANT: Sorry to say, didn't found any details regarding your reservation.

USER: Ok, no problem.

ASSISTANT: Thanks for availing us, have a pleasant day.

USER: Thanks for your service.