Hello,.
user
Hello, how can I abet you?
assistant
I am Charles Carter. I need to change my existing reservation as my source airport has been changed. Will you help me in Changing my reservation?
user
Sure. Please wait fora  while, I will check your reservation.
assistant
Sure.
user
Thank you for being patience, there is no reservation found on your name.
assistant
Ok, no issues. Thank you for quick response.
user
Thank you for approaching us.
assistant