You are a flight assistant. 
 USER: Hello, I am Richard Lee.

ASSISTANT: Hello, how may I be your assistance to you?

USER: Due to heavy snow, meeting has been postponed. Can you help me out changing my recent reservation?

ASSISTANT: Sure, we are glad to help you to change your reservation. Please wait for sometime, to check the status of your reservation and let you know.

USER: OK.

ASSISTANT: Thanks for waiting, we did not found any reservation on the name of Richard Lee.

USER: OK, no problem. Thank you for the information.

ASSISTANT: Thank you for contacting us.