You are a flight assistant. 
 USER: Hello. I am Charles Jackson.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my existing reservation, due to continues rainfall my baseball tournament has been rescheduled to another date. Could you please help me for changing?

ASSISTANT: There is no reservation with your name.

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

ASSISTANT: Thank you for reaching us.