You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am James Robinson.

ASSISTANT: How can I aid you?

USER: Can you please help me to modify my reservation as my schedule got postponed due to bad weather condition?

ASSISTANT: Sure, please allow me a moment to check for your previous reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting. Sorry to say, there is no active reservation have been found under your name in our database to amend it.

USER: Not a problem, it might not be done properly at the time of booking. Anyways thank you for the information.

ASSISTANT: Thank you for reaching us.