Hi.
user
Hello. How may I help you?
assistant
I am Jessica Collins, in my previous reservation I gave wrong airport codes, so can you help me for changing my existing reservation?
user
 Sure, please wait a moment.
assistant
Ok, I will wait for your reply.
user
Collins, no reservation has been found on your name.
assistant
Oh! It's ok, I think my sister's already changed my reservation. Thank you for your quick response.
user
Thank you for approaching us.
assistant