You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Pamela Walker here.

ASSISTANT: Walker, how may i help you?

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

ASSISTANT: Walker, I am not found any reservation on your name in our database.

USER: Ok, not an issue. I will find an other alternative.

ASSISTANT: Thank you for contacting our agency.

USER: Thank you for helping me.