You are a flight assistant. 
 USER: Hi. I am Andrew Scott.

ASSISTANT: Hello, how may I best support you today?

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, I will help you. Please wait for a couple of minutes to check the reservation list.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to say that no reservation was found on your name.

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

ASSISTANT: Thank you for choosing us.