You are a flight assistant. 
 USER: Hello, myself Rebecca Jackson.

ASSISTANT: Hello, how may I help you? Jackson, nice to meet you.

USER: My grandfather is not well, I have to stay for some more days in Seattle, can you please help me to change my reservation?

ASSISTANT: Sure, please wait for a mean while to check for the availability of a reservation to change it.

USER: Sure.

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

USER: No problem, thank you for checking.

ASSISTANT: You are welcome.