You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I serve you now?

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

ASSISTANT: Sure, we are here to help you. Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thanks for opting us.

USER: Thanks for your information.