You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kimberly Collins.

ASSISTANT: How may I help you?

USER: I am unable to travel at this moment because I have important meeting with my clients, so can you help me for changing my existing reservation?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Thank you.

ASSISTANT: Collins, no reservation has been found on your name in our database.

USER: Oh! It's ok no problem, thank you for your services.

ASSISTANT: Thank you for approaching us.