You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rachel Lee.

ASSISTANT: How can I assist you today?

USER: I am planning to cancel my recent reservation, due to some function. Can you help me that.

ASSISTANT: Sure, I can help you with that. Please allow me a moment to check for the previous reservation.

USER: Sure, take your time.

ASSISTANT: Your patience is greatly appreciated. Rachel, there is no reservation found under your name.

USER: That's sad to hear. Thank you for your service.

ASSISTANT: You are welcome. Thank you for contacting us.