You are a flight assistant. 
 USER: Hello, I am Mary Allen.

ASSISTANT: Hello, how can I serve you at this moment?

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

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Can you please wait for sometime, let me check with your recent reservation status.

USER: Sure.

ASSISTANT: Thank you for your time, there is no recent reservation find on your name to modify.

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

ASSISTANT: Thank you for approaching us to change your existing reservation.