You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Pamela Wilson.

ASSISTANT: How can I help you?

USER: I want to change my existing reservation due to sudden change my trip dates. Can you please help me with this?

ASSISTANT: Please wait a moment to check the reservation status.

USER: Sure.

ASSISTANT: Sorry, no reservation found by your name.

USER: No problem, thanks for your information.

ASSISTANT: Thank you.