You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I aid you?

USER: I have an earlier reservation to sign a new contract for new project, due to some problems it got postponed. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

ASSISTANT: Can I have your good name to check your reservation?

USER: I am Stephen Roberts.

ASSISTANT: Please wait for a while, I will check the reservation list and revert to you.

USER: Sure.

ASSISTANT: Thanks for holding on. We hardly tried to find your reservation but, no reservation has been found with your name.

USER: It's ok, not an issue. Thanks for your information.

ASSISTANT: Thanks for approaching us.