You are a flight assistant. 
 USER: Hello, I am Anna Thompson.

ASSISTANT: Hello. How can I aid you?

USER: My baseball tournament has been preponed. I would like to change my existing reservation. Could you please help me with changing?

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT:  Sorry, there were no flights available on your requested dates.

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

ASSISTANT:  Thank you for availing us.