You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve your at this moment?

USER: Can you please help me with changing my recent reservation?

ASSISTANT: Sure, may I know your good name please?

USER: My name is Helen Lopez.

ASSISTANT: Ok, please wait for few minutes.

USER: Ok.

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

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.