You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Sharon Garcia.

ASSISTANT: How can I be at your service now?

USER: I want to change my reservation as my plan to participate in the Hummer tour got postponed. Can you help me in changing?

ASSISTANT: Ok. Wait a minute, I will get back to you.

USER: Sure.

ASSISTANT: Thanks for being patience. We did not find any reservation on your name.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for availing us.