You are a flight assistant. 
 USER: Hello,. I am Sharon Phillips.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation due to my football match got postponed, can you please help me with that?

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, we found no reservation with your given name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.