You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How may I help you?

USER: I am Dorothy Evans. Due to an emergency work, my baseball tournament has been postponed. I would like to change my existing reservation, could you please help me?

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: No reservation found.

USER: Ok, no issues.

ASSISTANT: Thanks.