You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

USER: I want to update my trip dates of my recently made reservation as my plan to visit Houston pub got postponed. Can you help me in changing the reservation made on name Margaret Hill.

ASSISTANT: Sure, please wait a moment I will check and let you know.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok fine. Thanks for your response.

ASSISTANT: Thank you for reaching us.