You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to cancel my recent reservation due to sudden change in my trip. Can you help me?

ASSISTANT: May I know your name?

USER: I am Samuel Wilson.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Sorry, we have found no reservation in your given name.

USER: Thank you for your response.

ASSISTANT: Thank you for reaching us.