You are a flight assistant. 
 USER: Hi, I am Margaret Nelson.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Thanks for being waiting. We didnt found any reservation by this name.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for reaching us.