You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Christopher Hall. Due to an emergency meeting, I want to change me reservation. Can you help me with it.

ASSISTANT: Sure, we are here to help you. Please wait a moment, I will check your details in your previous reservation list.

USER: OK.

ASSISTANT: Thank you for your time, I have checked but there is no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting us.