You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Kathleen Hall.

ASSISTANT: Kathleen Hall, how may I render you?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, I can help you. Please give me a moment to check your ticket status.

USER: Ok.

ASSISTANT: Sorry, no reservation is available by your name.

USER: No problem, thanks for the help.

ASSISTANT: Thank you for choosing us.