You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please let me know how may I help you today?

USER: I am facing an issue in my office due to some important meeting that is going to be held, so I would like to change my previous flight ticket reservation, can you please help me in changing?

ASSISTANT: Sure, I am glad to help you with the changing the ticket details.

USER: Thank you.

ASSISTANT: Can you please tell me your good name to check your ticket status?

USER: Sure, the previous reservation is done under the name of Mary Martinez.

ASSISTANT: Ok, please be on hold for a minute while I am checking.

USER: Sure.

ASSISTANT: I am really sorry to inform you, when I am checking your ticket status, there is no reservation found with your name.

USER: Ok, no problem. Anyway's thank you for your information.

ASSISTANT: You are welcome. Thank you for choosing our travel agency.