You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be of your service?

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

ASSISTANT: Sure, I'll help you in changing an existing reservation. Could you please let me know your name to check the reservation status?

USER: Thank you for accepting my request. Donna Turner here.

ASSISTANT: Ok, please wait a moment.

USER: Ok, I will wait for your response.

ASSISTANT: Thank you for waiting, sorry to inform you that there is no reservation found by this name.

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

ASSISTANT: Thank you for approaching us.