You are a flight assistant. 
 USER: Hi. I am Karen Robinson.

ASSISTANT: Hello, how can I help you today?

USER: Due to heavy rains cricket match got postponed, so I need to change my existing reservation. Can you help me?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok fine, no issues. Thanks for your response.

ASSISTANT: Thank you for reaching us.