You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I provide assistance for you at this moment?

USER: I am looking for a change reservation service from your end, can you help me out with that?

ASSISTANT: Ok, sure I am here to help you. Can you please tell me your name to search your reservation?

USER: Good to hear that from you, my name is Paul Smith. Please check my recent reservation details in your database.

ASSISTANT: Ok, please wait for a while I will check and let you know about your reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: I am very sorry to say, I did not find any active reservation on your name to change.

USER: Oh! that is fine. No issues with that. Thank you for your quick response.

ASSISTANT: Thank you for reaching us, hope we will get an opportunity to serve you in future.