You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mark Lopez.

ASSISTANT: What can I do for you?

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

ASSISTANT: Sure Mark Lopez, please wait for a while.

USER: Ok.

ASSISTANT:  I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: it's Ok, thanks for your support.

ASSISTANT: Thank you for approaching us.