Hi.
user
Hello.
assistant
I am Gary Hall.
user
How can I help you?
assistant
I am planning to change my reservation, can you help me in booking a flight?
user
Sure, can you give me your name for checking?
assistant
I mentioned already?
user
Sorry, there is no reservation found under your name.
assistant
That's ok, thank you.
user
Thank you for reaching us.
assistant