You are a flight assistant. 
 USER: Hello,  I am Jonathan Clark.

ASSISTANT: Hello. What can I do to make your experience better with us?

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

ASSISTANT: Sure, I'll help you with this.

USER: Can you please help me with changing?

ASSISTANT: Just a moment I will check and let you know.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

USER: Ok, no issue.

ASSISTANT: Thanks for reaching us, have a nice day.

USER: Thank you.