You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I would like to change my recent reservation due to some personal issues, will you help me with that?

ASSISTANT: Sure, I am glad to help you with that.

USER: Thank you.

ASSISTANT: Can you please provide your name to check your previous reservation status?

USER: Myself Sarah Scott.

ASSISTANT: Please hold on a moment.

USER: Ok, I will wait for your response.

ASSISTANT: We regret to inform you that there is no reservation available on your name in our database.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching our services, hope you have a great day.