You are a flight assistant. 
 USER: Hello, I am Rachel Hall.

ASSISTANT: Hello, how can I aid you?

USER: As the convocation day which I want to attend in my college got postponed, I want you to change my reservation. Can you please help me in changing reservation?

ASSISTANT: Sure, I will help you. Please wait a while. I will check with reservation details and let you know.

USER: Ok.

ASSISTANT: Thanks for your patience. There was no reservation found on your name.

USER: It's ok, thank you for providing kind information.

ASSISTANT: Thank you for reaching us. Have a pleasant day.