You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Martin.

ASSISTANT: How can I aid you?

USER: The planned trip got postponed, so can you please help me in changing my flight ticket booking?

ASSISTANT: Sure, I am here to help you. Please, wait for a while.

USER: Thank you and I can wait for your response.

ASSISTANT: Sorry, there is no reservation on your name.

USER: No issues with that one, thank you for checking my reservation.

ASSISTANT: Thank you for reaching us.

USER: Welcome.