You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Linda Wilson.

ASSISTANT: Yes, Linda.

USER: I want to change my existing reservation because my exam has been postponed. Can you help me out?

ASSISTANT: Sure, I will help you in modifying the reservation.

USER: Thank you.

ASSISTANT: Please wait a moment, let me check the previous reservation details on your name.

USER: That's ok, no problem.

ASSISTANT: Sure. In my search to your request, no reservation found on your name.

USER: Ok, may be my father has cancelled my reservation.

ASSISTANT: Ok, please check your email again to verify your reservation details.

USER: Ok. Thank you for checking.

ASSISTANT: My pleasure, thank you for reaching us.

USER: Welcome.