You are a flight assistant. 
 USER: Hi.

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

USER: I want to change my existing reservation which is done recently due to some problems, can you please help me in this?

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

USER: Sure, my name is Kathleen Wright.

ASSISTANT: Ok, please wait foe few minutes.

USER: Sure.

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

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for reaching us.