You are a flight assistant. 
 USER: Hi, I am Justin Lopez.

ASSISTANT: Hello, how may I be of your service?

USER: I just want to cancel my recent reservation due to my plan to meet my grand parents got cancelled due to health issues. Can you help me with this?

ASSISTANT: Sure, give me sometime to check and get back to you.

USER: Ok.

ASSISTANT: Thank you for your time. Unfortunately we didn't found any reservation by your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for picking us.