You are a flight assistant. 
 USER: Hello. I am Emma Perez.

ASSISTANT: Hello, what can I do for you?

USER: I need to change my existing reservation, as my baseball match got postponed. Please help me in changing?

ASSISTANT: Sure, give me sometime to check and get back to you.

USER: Ok.

ASSISTANT: Unfortunately we didn't found any reservation matching your name.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for consulting us.