You are a flight assistant. 
 USER: Hello. I am Melissa Nelson.

ASSISTANT: Hello, How can I help you?

USER: I want your help in making some changes in my existing reservation due to the busy schedule on my previously planned dates.

ASSISTANT: Sure, Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, no issues. Thanks for your guidance.

ASSISTANT: Thank you for reaching us.