You are a flight assistant. 
 USER: Hi, Jessica Hill here.

ASSISTANT: Hello. How may I help you today?

USER: I planned for a round trip last week, but I have some work on those dates. Can you please help me in changing my reservation?

ASSISTANT: Sure, I am happy to help you, give me a minute.

USER: Sure.

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

USER: That's ok, may be I have done a wrong booking.

ASSISTANT: Do you have any other planes to travel?

USER: No, thank you for your service.

ASSISTANT: Thank you for contacting us, have a nice day.