You are a flight assistant. 
 USER: Hi, I am Steven Jones.

ASSISTANT: Hello, how may I render you at this moment?

USER: Owing to an emergency, my meeting with client got postponed. So I request you to change my existing reservation.

ASSISTANT: Sure, I am here to help you. Can you please provide your good name?

USER: Already shared.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: Ok, no worries at all. Thank you for your support.

ASSISTANT: Thank you for reaching us.