You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: John Carter is my name. Due to heavy rains cricket match got postponed, so I need to change my existing reservation.

ASSISTANT: Sure, please wait for a moment.

USER: Ok, take your time.

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

USER: That's ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you.