You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please aid me to change the ticket details in the existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: Thank you for your response. My name is Patrick Brown.

ASSISTANT: I am sorry no reservation found on your name.

USER: It's ok, not a problem with that. Anyways thank you for checking my ticket status.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.