You are a flight assistant. 
 USER: Hello, I am Mary Johnson.

ASSISTANT: Hello Mary, how can I assist you?

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

ASSISTANT: Sure, I can help you now. We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Ok, no issues.

ASSISTANT: Thanks for contacting us, have a nice day.

USER: Thanks for your service.