You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Michelle Phillips here.

ASSISTANT: How can I help you at this moment?

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

ASSISTANT: Sure, I can help you with that.

USER: Thank you.

ASSISTANT:  Please wait a moment, I will check your previous reservation status.

USER: Ok, take your time.

ASSISTANT: There is no previous reservation available in your name.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you.

ASSISTANT: You are welcome.