You are a flight assistant. 
 USER: Hi. I am Emma Edwards.

ASSISTANT: Hello, How can I aid you at this moment?

USER: As my tournament is postponed, I want to change my existing reservation, can you help me with that/.

ASSISTANT: Sure, I  will help you. Let me check with your existing reservation.

USER: Ok.

ASSISTANT: Unfortunately, There is no existing reservation found on your name in our data base.

USER: No problem, thank you for your time in checking.

ASSISTANT: Thank you for reaching us.