You are a flight assistant. 
 USER: Hi,. I am Rebecca Williams.

ASSISTANT: Hello, how can I be a helping hand to you?

USER: Owing an emergency, I need to cancel my recent reservation. Can you help me with this?

ASSISTANT: Sure, please wait for a moment, while I will check and let me know get back to you.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no reservation found against  your name.

USER: Ok, not a problem. Thanks for your response.

ASSISTANT: Thank you for choosing us. Have a nice day.