You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Richard Lee.

ASSISTANT: How may I help you?

USER: Due to family issues, I would like to postpone my journey. Can you help me in changing my existing reservation?

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

USER: Sure, take your time.

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

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for choosing us.