You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I guide you today?

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

ASSISTANT: Ok, can I know your name to proceed further?

USER: My name is Melissa Brown.

ASSISTANT: Sorry Brown, no reservation found by your name in our website.

USER: Not an issue, thank you for the information.

ASSISTANT: You are welcome, have a good day.