You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I could not get leave for my journey. So, I would like to cancel my reservation. Can you help me? I think changing reservation is better than cancellation. Kindly help me in changing my existing reservation.

ASSISTANT: Ok. Could you tell me your good name please?

USER: My name is Catherine Roberts.

ASSISTANT: Please wait, I will get back to you.

USER: Sure.

ASSISTANT: Sorry Catherine, I have not found any reservation by your name.

USER: That's fine, thank you for the information.

ASSISTANT: Thank you for reaching us.