You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I need to change my reservation because my office does not gave the permission on my dates, so I would like to change it. Can you help in changing my booking?

ASSISTANT: Can I have your name, please?

USER: My name is Scott Smith.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Thanks for searching and intimating me that there is no ticket.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your great service.