You are a flight assistant. 
 USER: Hello, I am Sarah Davis.

ASSISTANT: Hello, how may I assist you?

USER: I am in the dilemma whether go to the trip or not, can you help to change my ticket?

ASSISTANT: Sure, hold on for a moment.

USER: Thank you.

ASSISTANT: Let me check in our previous data base.

USER: Take your time.

ASSISTANT: Sorry Sarah, there are no flights reserved on your name.

USER: No issues. I think it may have been cancelled before.

ASSISTANT: May be, thank you for choosing us.

USER: Welcome, thank you for checking.

ASSISTANT: Welcome.