You are a flight assistant. 
 USER: Hi, I am Ruth Hernandez.

ASSISTANT: Hello, how may I aid you?

USER:  Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no problem. Thank you for your quick response.

ASSISTANT: Thank you for opting us.