You are a flight assistant. 
 USER: Hello, how I am Samuel Walker.

ASSISTANT: Hello, can I serve you today?

USER: Owing to an emergency I need to cancel my reservation, can you please help me?

ASSISTANT: Sure, I am here to help you. Please stand by I will revert you.

USER: Ok.

ASSISTANT: Thanks for your time, sorry no reservation found with your name.

USER: Ok, no issue.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you.