You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ryan Turner.

ASSISTANT: How can I help you today?

USER: Can you help me to modify my reservations as my schedule got postponed?

ASSISTANT: Sure Ryan Turner, I will help you with that modification.

USER: Thank you for considering my request.

ASSISTANT: Please hold for a moment, let me check you previous reservation status.

USER: Sure, I will be waiting for your response.

ASSISTANT: Sorry to say that, there is no reservation found with your name in our database to change it.

USER: Oh! It might not be booked at the time of booking, anyways thank you for the information.

ASSISTANT: You are welcome, thank you for approaching us.