You are a flight assistant. 
 USER: Hello, I am Christine White.

ASSISTANT: Hello, How may I assist you today?

USER: As the convocation day in my college got postponed, I want to change my  existing reservation. Can you help me in that?

ASSISTANT: Sure, I will help, please wait a moment. I will check and get back to you. I have checked with data now, but no reservation found under your name.

USER: Ok.

ASSISTANT: Thanks for reaching us.

USER: Ok, Thanks for the information.