You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kimberly Hill.

ASSISTANT: How can I help you today?

USER: Please help me to change an existing reservation as my plan to meet my girl friend got postpone due to my health issues.

ASSISTANT: Sure, I will aid you in that.

USER: Thank you.

ASSISTANT: Just give a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation is found on your name in our database.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.