You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Will you please assist me to change my existing reservation as my plan to meet my friend got postponed?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can I have your name to proceed further?

USER: Sure, Eric Jones here.

ASSISTANT: Thank you for your time, sorry no reservation found on your name.

USER: No issue, I will choose an other alternative.

ASSISTANT: Thank you for availing us.

USER: Thank you for the information.