You are a flight assistant. 
 USER: Hello. Stephanie Clark here.

ASSISTANT: Hello. How can I assist you today?

USER: Due to sudden change in my planned date of journey, I would like to change my reservation. Can you please help me out with changing of my reservation?

ASSISTANT: Sure, I will help you on that. Please give me a moment.

USER: Sure, take your time.

ASSISTANT: There is no reservation found under your name.

USER: Oh! I think the ticket was not booked properly while I am booking. Thank you for the information.

ASSISTANT: Welcome, have a great day.