You are a flight assistant. 
 USER: Hello. Mary Martinez here.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Due to sudden health issue, I am unable to travel in a flight on those dates, can you please help me out with cancelling of my reservation?

ASSISTANT: Yes, I am blissful to help you, please wait I will check with that one.

USER: Thank you. Sure, take your time to check.

ASSISTANT: Thank you for waiting. I could not found any previous booking done the name which you have provided when I check in our data base.

USER: Oh! may be something went wrong on that situation. Anyway, thank you for the information.

ASSISTANT: Thank you for communicating with us.

USER: Welcome.