Hello,. I am Alexander Green.
user
Hello, how can I help you today?
assistant
I just want to change my existing reservation due to sudden demise of  My Grandfather. Can you help me with that?
user
Sure, please wait a while I will check and let you know.
assistant
Sure.
user
Thank you for waiting. Sorry, we did not found any flight based on your name.
assistant
Ok, no issue.
user
Thank you for approaching us.
assistant
Thank you for your help.
user