You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, may I know your name?

USER: I am Stephanie Phillips.

ASSISTANT: How can I help you today?

USER: I have an issue with my existing reservation and I want to change it. Can you help me in doing this?

ASSISTANT: Sure, I will help you. Please wait for a moment, I will check and back to you.

USER: OK.

ASSISTANT: Thanks for patience, sorry there is no reservation is found on your name.

USER: OK. No issues thanks for your response.

ASSISTANT: Thank you. Have a nice day.