You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Patricia Mitchell, can you help me to modify my reservation which is done last week?

ASSISTANT: Patricia Mitchell, I am glad you have contacted us. I will help you.

USER: Ok, thank you.

ASSISTANT: I am sorry to inform you that there is no booking done on your name.

USER: Thank you for assisting me with my concern, that is ok if you did not find, I will check my mails to know the state of my reservation.

ASSISTANT: Thank you for reaching us. Have a great day.