You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Stephanie Carter. Due to sudden change in the dates of summit which was going to be held in the place,so can you please help me? Please help me with changing the reservation.

ASSISTANT: Sure, I can help you with that. Please allow me a moment to check the details for you.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting. Stephanie, there is no reservation found under your name.

USER: It's ok fine. Thank you for your help.

ASSISTANT: You are welcome. Thank you for contacting us.