You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Susan Harris.

ASSISTANT: How may I help you out?

USER: I would like to change my existing reservation due to change in the climate. Could you please help me?

ASSISTANT: Sure, I will help you in changing the ticket. Sorry, there are no reservations found in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.