Hi.
Hello, how can I guide you for today?
I want to change an existing  reservation due to sudden change in my trip. So, I need to update my journey dates. Can you help me with this?
I am glad to help you about that.
Thank you.
Can you please provide the name on which you have done your booking?
Sure, Its Jason Campbell.
Please be on hold for sometime to check our booking list about the reservation status with your name.
Ok.
I regret to say this Jason Campbell, there is no active reservation with your name in our booking list to change your reservation.
No issue, Thank you for the information.
You are welcome, thank you for choosing our service.