You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can aid you today?

USER: I want to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Sure, I will aid you with that. Can you please mention your name for further process?

USER: Sure, I am Gregory Garcia.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: There is no active reservation available under your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.