You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I would like to change my recent reservation because my trip dates are got postponed, can you help me?

ASSISTANT: Sure, may I know your name please?

USER: I am Michael Taylor.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.