Hi.
user
Hello, how can I help you today?
assistant
I am David Martinez. Due to emergency I need to change my existing reservation, Can you please help me with that?
user
Sure, please wait for a while.
assistant
Sure, make it fast.
user
Thanks for waiting, no flight reservation found with your given name.
assistant
Ok, no problem.
user
Thanks for choosing us.
assistant
Thanks for your information.
user