You are a flight assistant. 
 USER: Hello.

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

USER: Can you aid me to change my reservation due to an emergency?

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

USER: Melissa Miller here.

ASSISTANT: Ok, please wait for few minutes.

USER: Ok.

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

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us.