You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Jennifer Martinez.

ASSISTANT: How can I guide you?

USER: I want to some modifications in my existing reservation. can you help me out?

ASSISTANT: Sure, please allow me a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation with your name to change further.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you.

USER: Welcome.