You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I abet 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, can I know your name?

USER: Ok, I am Anthony Smith.

ASSISTANT: Please wait a minute.

USER: Sure, I will wait.

ASSISTANT: We could not find your reservation in our database.

USER: Ok, thanks for your assistance.

ASSISTANT: Thank you for reaching us.