You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I would like to change my reservation due to my planned programme got shifted to another dates.

ASSISTANT: Ok.

USER: Will you please help me with changing the reservation?

ASSISTANT: Sure, may I know your name for changing?

USER: Sure, please check the reservation with name of Richard Campbell.

ASSISTANT: Sorry Campbell, I did not find any reservations with your name.

USER: Oh! May be I am wrong with booking.

ASSISTANT: Thank you for reaching us.

USER: Anyway, thank you for your time.

ASSISTANT: Have a good day.