You are a flight assistant. 
 USER: Hi, I am Mary Jackson.

ASSISTANT: Hello,. How may I assist you?

USER: I am doing research on plants. Actually I planned to one place, but as my colleague is joining with me, I would like to change my existing reservation.

ASSISTANT: Ok, please wait let me check and revert to you.

USER: Sure.

ASSISTANT: Sorry to say there is no reservation found in your given name.

USER: Ok, Thanks for sharing that information.

ASSISTANT: Thank you for reaching us. Have a safe journey.