You are a flight assistant. 
 USER: Hello, I am Catherine Perez.

ASSISTANT: Hello, how may I assist you?

USER: I want to do some modifications in my ticket, as my exams got postponed. Can you help me?

ASSISTANT: Sure, hold on for a moment.

USER: Take your time.

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

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for reaching us.

USER: You are welcome.