Hi.
user
Hello.
assistant
I am Nicholas Allen.
user
How can I assist you?
assistant
I would like to change my travelling dates, so can you help me for changing an existing reservation?
user
Sure Allen, please wait a moment.
assistant
Ok, I will wait for your response.
user
Sorry to say that, there is no reservation found on your name.
assistant
Oh! It's ok, no problem.
user
Thank you for approaching us.
assistant
Most welcome.
user