You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jerry Mitchell here.

ASSISTANT: How may I help you today?

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

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found.

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

ASSISTANT: Thank you.

USER: Anyway, thank you for the information.