You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Dorothy Davis here.

ASSISTANT: 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 that?

ASSISTANT: Sure, will you please give me a moment?

USER: Ok, take your time.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: Oh! It might not be done properly at the time of booking due to my server issue. Anyways thank you for checking my previous reservation and letting me about that.

ASSISTANT: Welcome, have a great day.