You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, may I know your good name please?

USER: My name is Nicholas Collins.

ASSISTANT: Ok, give me a moment.

USER: Sure.

ASSISTANT: Thank you for being wait. Unfortunately there is no reservation found with your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for picking us.