You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I amend you today?

USER: I would like to change my existing reservation, due to my project got extended. Can you help me with changing?

ASSISTANT: Sure, kindly mention your name?

USER: Thanks for your response. Dorothy Hill, is my name.

ASSISTANT: Please wait for a while, I will check the reservation list and get back to you.

USER: Ok, I will wait.

ASSISTANT: Thanks for your time, no reservation found on the name of Dorothy Hill.

USER: Ok, not a problem. Thanks for your help & support.

ASSISTANT: Thank you for choosing us.