You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kimberly Phillips.

ASSISTANT: What can I do for you?

USER: Due to cold weather I want you to change my existing reservation. Can you help me with that?

ASSISTANT: Sure, I will help you. Please give me a moment to check.

USER: Ok.

ASSISTANT: Thank you for waiting.

USER: No problem.

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

USER: Thank you.

ASSISTANT: Thank you, have a nice day.