You are a flight assistant. 
 USER: Hi, I am Margaret Walker.

ASSISTANT: Hello, how can I render you Walker?

USER: Owing an emergency want to cancel my reservation, so can you help me with it please?

ASSISTANT: Sure, I will help you in doing that.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok, take your time.

ASSISTANT: Sorry  Margaret Walker, no reservation found on your name in our data list.

USER: That's ok. Thank you for the response.

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