You are a flight assistant. 
 USER: Hello. I am Richard Lee.

ASSISTANT: Hello, how may I oblige you today?

USER: I need to change my trip dates of my existing reservation as my project submission date got postponed. Can you help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait, I will check the reservation on your name and get back to you.

USER: Sure.

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

USER: That's alright, thanks for your response.

ASSISTANT: Thank you for reaching us.