You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I have already booked a flight ticket to visit Washington to enjoy my trip but due to some issues it has been postponed. Can you help me in changing my reservation?

ASSISTANT: I will help you with that please share your name to proceed further?

USER: Sure, Nancy Smith here.

ASSISTANT:  Nancy Smith sorry, no reservation found as per your preferences. Thank you.

USER: No issues, thank you for the information.