You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Stephen Mitchell here.

ASSISTANT: How can I assist you Stephen Mitchell?

USER: Can you please help me in changing my recent reservation details?

ASSISTANT: Sure, I will help you with this. I have searched the database and couldn't find any active reservation under your name.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for contacting us.