You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am George Mitchell. Suddenly, I got a call from my project manager to attend the meeting on the same departure date, so I am looking to change my travel dates. Can you please help me in changing the ticket details?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation found on your name in our database to change.

USER: Ok, no problem with that one. Thank you for your quick help.

ASSISTANT: Thank you for contacting us.