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

ASSISTANT: Hello,. How can I render you today?

USER: I want to change a existing reservation due to sudden change in my trip. Can you help me with this?

ASSISTANT: Sure, we are here to aid you.

USER: Thank you.

ASSISTANT: Please, wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no reservation found on your name in our database.

USER: No issue, I will choose other alliterative.

ASSISTANT: Thank you for opting us.

USER: Thank you for your information.