You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to Google booking agency.

USER: I am Pamela Walker.

ASSISTANT: Hi Pamela, how may I help you today?

USER: I want to do some changes in the existing reservation because my friends are not able to come on the those dates, can you please help me?

ASSISTANT: Sure, please wait a moment to check your active reservation status. Sorry Pamela, there is no reservation found under your name in our database.

USER: That'a fine.

ASSISTANT: Would you like to ask us anything else?

USER: Thank you for your service. No thanks.

ASSISTANT: Ok, thank you for using our services, have a nice day.