You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Helen Thompson.

ASSISTANT: 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: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait a while. I will check the reservation list.

USER: OK.

ASSISTANT: Thanks for your patience. There was no reservation found on your name.

USER: No issue. Thank you.

ASSISTANT: Thank you for selecting our service.