You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need your assistance in making few changes in my recent flight booking. As I have rescheduled my trip. Please help me.

ASSISTANT: Sure, please help me with your name.

USER: My name is Shirley Carter.

ASSISTANT: I will check your reservation and get back to you.

USER: Thank you.

ASSISTANT: I am sorry, I did not find any reservation under your name in our database.

USER: Oh! can you recheck it. As I am sure that I have booked it on my name.

ASSISTANT: Sure, please wait.

USER: Thank you.

ASSISTANT: Sorry, I have rechecked it. I have not found any reservation under your name.

USER: Thanks for your time.

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