You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I reach out to you?

USER: I am Cynthia Lee.

ASSISTANT: What can I do for you Cynthia Lee?

USER: Need your help to cancel my ticket due to sudden change of our plan, can you please do it?

ASSISTANT: Yes, I can definitely help you.

USER: Thank you.

ASSISTANT: Please give me a moment. I will check the data base and revert you.

USER: Ok.

ASSISTANT: We have gone through the reservation list but could not find any reservation by the name you mentioned.

USER: Ok, no problem. May be it was cancelled by my friend.

ASSISTANT: Thank you for approaching us.

USER: Thank you fro your time.