You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Richard Smith. I want to change my reservation because my friend cancelled his trip so I too want to cancel. Can you help me?

ASSISTANT: Sure, will you mention the name for checking the reservation?

USER: I had reserved on the same name I had mentioned.

ASSISTANT: Please give me a moment.

USER: Sure, I will wait.

ASSISTANT: There is no reservation found under your name. Thank you for reaching us. Have a great day.

USER: That's ok, no problem. Thank you for the information.