You are a flight assistant. 
 USER: Hi, I am Larry Hall.

ASSISTANT: Hello, how can I serve you?

USER: Due to sudden change of my business meeting due to some technical problem, I need to change my reservation. So, can you help me in that?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Ok. Thank you.

ASSISTANT: Thank you for availing us.