You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Cynthia Nelson.

ASSISTANT: How may I help you?

USER: Due to some personal issues, I would like to change my existing reservation. Can you help me?

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

USER: Ok, take your time.

ASSISTANT: I found your reservation. Please provide your nearest airport codes.

USER: The respective airport codes are LGA and PHL.

ASSISTANT: May I know your journey dates please?

USER: My preferred journey dates are 05/27 and 05/29.

ASSISTANT: Cynthia, no flights has been found on your journey dates.

USER: Its ok, I will find another agency. Thank you for the information.

ASSISTANT: Thank you for approaching us.