You are a flight assistant. 
 USER: Hello, Scott Martinez here.

ASSISTANT: Hello. How can I assist you today?

USER: Due to my ill health, I couldn't make my trip to Dallas. Can you please help me by changing the existing reservation?

ASSISTANT: Sure, please give me a moment. Thank you for waiting. There is no reservation found under your name.

USER: It's ok, not an issue. May be something went wrong while booking.

ASSISTANT: Thank you for reaching us, have a great day.

USER: Anyway, thank you for providing information.