You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I render you today?

USER: Please change my existing reservation as my seminar got postponed.

ASSISTANT: Sure, we are here to aid you.

USER: Thank you.

ASSISTANT: To check with the reservation, I need your name.

USER: My name is Melissa Nelson.

ASSISTANT: Please, stay online.

USER: Sure.

ASSISTANT: Thanks for your time.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for availing us.