You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to change my recent reservation as my joining date got postponed. Can you help me in changing?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Jennifer Lee is my name.

ASSISTANT: Ok, please stand by.

USER: Ok.

ASSISTANT: Thank you for waiting.

USER: No worries, thank you for your information.

ASSISTANT: Sorry to say no reservation found on your name.

USER: No problem.

ASSISTANT: Thank you for the reaching us, have a nice day.

USER: Thank you.