You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Will you please assist me in changing the existing reservation that I made earlier to go for holiday trip?

ASSISTANT: Sure, can I have your name?

USER: I am Carolyn Allen.

ASSISTANT: Please wait for a moment to check your details.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your response.