You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, will you mention your name please?

USER: Samantha King.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found under your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Welcome, have a great day.