You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Mary Lee.

ASSISTANT: How can I help you?

USER: Can you please help me with changing my reservation?

ASSISTANT: Sure, I will help you with that. Can you please wait a minute?

USER: Thank you, take your time.

ASSISTANT: Sorry to tell you, I have not found your ticket reservation in our database.

USER: Oh! It may not be booked properly. Anyway, thank you for your time.

ASSISTANT: You are welcome, thank you for choosing us.