You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER:  I am Nicholas Williams want to change my reservation owing an emergency meeting. Can you please help me in changing?

ASSISTANT: Sure, we are here to help you. Please wait a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation was found on your name in the database.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your help.