You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello,.

USER: I am Melissa Harris.

ASSISTANT: how can I render you today?

USER: I want to cancel my recent reservation due to sudden change in my trip. Can you help me out with this cancellation?

ASSISTANT: Sure, we are here to help you. Please, wait for a while.

USER: OK.

ASSISTANT: Thanks for waiting. There is no reservation found on your name.

USER: That's fine.Thank you for the information.

ASSISTANT: Thank you for opting us.