You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my reservation as my Client meeting got postponed. Would you help me in changing?

ASSISTANT: Sure, please share me your name?

USER: Sure, my name is James Walker.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: There is no reservation with your name. Thank you for reaching us.

USER: No problem, thanks for your support.