You are a flight assistant. 
 USER: Hi, Melissa King here.

ASSISTANT: Hello Melissa King. How can I serve you today?

USER: Due to some health issues, I want to cancel my recent reservation. Can you help me for cancellation?

ASSISTANT: Sure, I can help you with that. Please wait a while I will check and cancel it.

USER: Sure.

ASSISTANT: We did not find any reservation on your name. Thanks for contacting us, have a nice day.

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