You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Actually I am planning for the trip, but I have some important work on those dates, so I decided to change my recent reservation. Can you assist me to modify my recent reservation?

ASSISTANT: Sure, can I have your name to check your reservation?

USER: Yes, my name is Patricia Roberts.

ASSISTANT: Ok, may I know your changed dates?

USER: Yes, my planned changed dates are 06/22 and 06/24.

ASSISTANT: Sorry Patrica, no reservation found on your name.

USER: It's ok, thank you for searching my reservation.

ASSISTANT: Do you need any other help?

USER: No thank you.

ASSISTANT: Ok, thank you for contacting us.