Hello. I am Melissa Young.
user
Hello, how may I help you?
assistant
Due to some reasons my trip postponed can you help me to change my existing reservation?
user
Sure, wait for a minute.
assistant
Ok.
user
Sorry Young, no reservation found on your name.
assistant
It's ok.
user
Do you want any other help?
assistant
No thanks. Thank you for your information.
user
Ok, thank you for contacting  us.
assistant