You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to cancel my reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Sure, I will help you. Please provide me your name.

USER: Sure, my name is Rebecca Williams.

ASSISTANT: Williams, I did not find any reservation under your name in our database.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: You are welcome and thank you for choosing us.