You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: Can you help me in changing my existing reservation? As my football match has been postponed to Mar 21st.

ASSISTANT: Sure, I will help you with that, may I know your name to check your recent reservation?

USER: Thank you for considering my concern and myself Donna Martin.

ASSISTANT: Please wait for some time.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: That's ok, not an issue, I guess something went wrong while doing my reservation. It has not done properly actually. I will check my email about this concern. Thank you for your information.

ASSISTANT: Thank you for reaching us.