Hello.
Hello, how may I be at your service today?
 Owing to an emergency, I want to change my reservation. Can you please help me with that?
May I know your name please to check the status of your reservation?
David Campbell here.
Thank you. Please stay online for a while, I will check your reservation status and let you know.
Ok.
Sorry, there is no reservation matching with your name in our portal to make changes further.
Thank you.
Thank you for reaching us.