Hello.
user
Hello. How may I help you?
assistant
I am Melissa Green. I want to change an existing reservation.Can you help me?
user
Sure Melissa,wait for a moment to check it?
assistant
OK.
user
Thank you for waiting. sorry, that I could found a reservation on requested name .
assistant
May I know my flight details?
user
Sorry, there is no reservation found Melissa.
assistant
OK, thank you.
user
Thank you . Have a good day.
assistant