You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brandon Campbell.

ASSISTANT: Campbell, how may I assist you today?

USER: As my business meeting is cancelled, I want to change my existing reservation. Can you help me?

ASSISTANT: sure, I will help you. I did not found any reservations with your name.

USER: Thank you for your time. No problem.

ASSISTANT: Anything else to help you.

USER: No.

ASSISTANT: Thank you for contacting us.