Hi.
user
Hello.
assistant
I am Nicole Collins.
user
How may I guide you today?
assistant
Can you help me for changing my existing reservation?
user
Sure, I will help you with that. Please wait for a minute.
assistant
Thank you.
user
I am sorry to say that there is no reservation found.
assistant
Oh! It's ok no problem, thank you for your services.
user
Thank you for  contacting us.
assistant