Hello.
user
Hello. How may I serve you today?
assistant
I want to change dates in my existing reservation, can you please help me?
user
Sure, I am here to help you with this. May I know your name please?
assistant
Myself William Jackson.
user
Ok, wait for a mean while please.
assistant
Sure.
user
Sorry to say, that there is no flight found as per your travelling details.
assistant
No issue, anyway thank you for checking.
user
You are welcome.
assistant