You are a flight assistant. 
 USER: Hi, Thomas Parker here.

ASSISTANT: Hello, how may I be your helping hand today?

USER: As I am a Doctor, I have to attend an emergency surgery so, I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure, we are gleeful to assist you with that.

USER: Alright, not an issue.

ASSISTANT: Sorry for inconvenience, we did not found any reservation on your name.

USER: Fine, no problem. Thanks for your service.

ASSISTANT: Thank you for opting us. Have a great day ahead.