You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Ruth Mitchell.

ASSISTANT: Ruth, how can I help you today?

USER: Actually, I booked a ticket to IAD for a music event but due to bad weather, the event is postponed. Could you help me in changing my existing reservation?

ASSISTANT: Sure, I will help you to change your reservation. Can you tell me your name for checking your reservation status?

USER: My name is Ruth Mitchell.

ASSISTANT: Sorry Mitchell, I have not found any reservation by your name in our database.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you for choosing us and have a nice day.