You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER:  I am Ruth Hernandez want to change my reservation due to prepone of my exams. Can you help me in changing?

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for availing me.