You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dorothy Thomas.

ASSISTANT: How may I help you now?

USER: Owning to an emergency I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Ok, please allow me to check with your previous booking for a moment.

USER: Sure.

ASSISTANT: Sorry to say, there is no active reservation under your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for approaching our services.

USER: Thank you for the information.