You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you today?

USER: Jerry Jones here. Is this a flight booking agency?

ASSISTANT: Yes, you are right place and I am your agent for today. How can I assist you?

USER: Thank you. Actually, I have booked my ticket previously, so I need to do some changes in my existing reservation due to some weather issue.

ASSISTANT: I am here to solve your problem. Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry Jones, no reservation found on your name to change your reservation.

USER: No problem, may be my ticket has not booked properly.

ASSISTANT: Thank you for reaching us.

USER: Welcome.