You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Could you please help me to update my travelling dates in my existing reservation as my trip got postpone due to bad weather conditions?

ASSISTANT: Sure, may I know your name to check with the previous reservation.

USER: I am Nicholas Miller.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no active reservations on your given name to change.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching our service.

USER: Thank you for your information.